I am not a Hebrew scholar - can't read it!
What I am pointing out is that you are quoting an English translation of a Greek translation of the Hebrew original.
Our modern English translations are directly translated from the Hebrew original.
The Septuagint definitely has value as a resource - I am not arguing that. It can be useful to help us understand how the Jews of the several centuries before Christ interpreted and understood the Old Testament.
It does not make sense, though, (to me at least) to use an English translation of the Septuagint to try to debunk someone's interpretation of Daniel's vision.
I don't see where the LXX translation supplies any difference in meaning (as Dave-L suggests... but seems nothing more than a ruse):
LXX -
Dan 9:25 -
καὶ G2532 γνώσῃ G1097 καὶ G2532 συνήσεις G4920 ἀπὸ G575 ἐξόδου G1841 λόγου G3056 τοῦ G3588 ἀποκριθῆναι G611 καὶ G2532 τοῦ G3588 οἰκοδομῆσαι G3618 Ιερουσαλημ G2419 ἕως G2193 χριστοῦ G5547 ἡγουμένου G2233 ἑβδομάδες ἑπτὰ G2033 καὶ G2532 ἑβδομάδες ἑξήκοντα G1835 δύο G1417 καὶ G2532 ἐπιστρέψει G1994 καὶ G2532 οἰκοδομηθήσεται G3618 πλατεῗα G4113 καὶ G2532 τεῗχος G5038 καὶ G2532 ἐκκενωθήσονται οἱ G3588 καιροί G2540
Dan 9:26 -
καὶ G2532 μετὰ G3326 τὰς G3588 ἑβδομάδας τὰς G3588 ἑξήκοντα G1835 δύο G1417 ἐξολεθρευθήσεται χρῗσμα G5545 καὶ G2532 κρίμα G2917 οὐκ G3756 ἔστιν G1510 ἐν G1722 αὐτῷ G846 καὶ G2532 τὴν G3588 πόλιν G4172 καὶ G2532 τὸ G3588 ἅγιον G40 διαφθερεῗ G1311 σὺν G4862 τῷ G3588 ἡγουμένῳ G2233 τῷ G3588 ἐρχομένῳ G2064 καὶ G2532 ἐκκοπήσονται ἐν G1722 κατακλυσμῷ G2627 καὶ G2532 ἕως G2193 τέλους G5056 πολέμου G4171 συντετμημένου G4932 τάξει G5010 ἀφανισμοῗς G854
Dan 9:27 -
καὶ G2532 δυναμώσει G1412 διαθήκην G1242 πολλοῗς G4183 ἑβδομὰς μία G1520 καὶ G2532 ἐν G1722 τῷ G3588 ἡμίσει G2255 τῆς G3588 ἑβδομάδος ἀρθήσεταί G142 μου G1473 θυσία G2378 καὶ G2532 σπονδή καὶ G2532 ἐπὶ G1909 τὸ G3588 ἱερὸν G2413 βδέλυγμα G946 τῶν G3588 ἐρημώσεων G2050 καὶ G2532 ἕως G2193 συντελείας G4930 καιροῦ G2540 συντέλεια G4930 δοθήσεται G1325 ἐπὶ G1909 τὴν G3588 ἐρήμωσιν G2050
____________
LXX - [bracketed words are filled in]
Dan 9:25 -[/B]
καὶ G2532 γνώσῃ G1097 [KNOW] καὶ G2532 συνήσεις G4920 [UNDERSTAND] ἀπὸ G575 [FROM] ἐξόδου G1841 [EXODUS (going forth)] λόγου G3056 [WORD / COMMAND / DECREE] τοῦ G3588 ἀποκριθῆναι G611 [TO BEGIN TO SPEAK (issuance / issued ['
to give forth a decision [/judgment] from myself'])] καὶ G2532 τοῦ G3588 οἰκοδομῆσαι G3618 [TO BUILD] Ιερουσαλημ G2419 [JERUSALEM] ἕως G2193 [TILL / UNTO] χριστοῦ G5547 [CHRIST (MESSIAH)] ἡγουμένου G2233 [PRINCE] ἑβδομάδες ἑπτὰ G2033 [SEVEN SEVENS] καὶ G2532 ἑβδομάδες ἑξήκοντα G1835 δύο G1417 [SIXTY-TWO SEVENS] καὶ G2532 ἐπιστρέψει G1994 [AGAIN (in Heb: H7725--used twice in this verse)] καὶ G2532 οἰκοδομηθήσεται G3618 [TO BUILD] πλατεῗα G4113 [STREET] καὶ G2532 τεῗχος G5038 [WALL] καὶ G2532 ἐκκενωθήσονται [_____ (anguish?? / troublous??)] οἱ G3588 καιροί G2540 [TIMES]
[compare with:
https://biblehub.com/text/daniel/9-25.htm ]
Dan 9:26 -
καὶ G2532 μετὰ G3326 [WITH/ACCOMPANY (afterwards; in Heb: H310 hinder part)] τὰς G3588 ἑβδομάδας [SEVENS] τὰς G3588 ἑξήκοντα G1835 δύο G1417 [SIXTY-TWO] ἐξολεθρευθήσεται [_____(related to the G1835 word, I think <--)] χρῗσμα G5545 [ANOINTED] καὶ G2532 κρίμα G2917 [JUDGMENT / CUT OFF] οὐκ G3756 [NOT / NOTHING] ἔστιν G1510 [HAVE] ἐν G1722 [IN] αὐτῷ G846 [HIMSELF]
καὶ G2532 τὴν G3588 πόλιν G4172 [CITY] καὶ G2532 τὸ G3588 ἅγιον G40 [HOLY (things)] διαφθερεῗ G1311 [DESTROY] σὺν G4862 [(those) 'IDENTIFIED-WITH'] τῷ G3588 ἡγουμένῳ G2233 [PRINCE] τῷ G3588 ἐρχομένῳ G2064 [TO COME] καὶ G2532 ἐκκοπήσονται [____ (anguish?? / troublous??)] ἐν G1722 [IN] κατακλυσμῷ G2627 [FLOOD] καὶ G2532 ἕως G2193 [TILL / UNTO] τέλους G5056 [END] πολέμου G4171 [WAR] συντετμημένου G4932 [AN EXPIDITED DECREE] τάξει G5010 [ORDER / FIXED ARRANGEMENT] ἀφανισμοῗς G854 [DESTRUCTION]
[compare with:
https://biblehub.com/text/daniel/9-26.htm ]
Dan 9:27 -
καὶ G2532 δυναμώσει G1412 [CONFIRM / STRENGTHEN] διαθήκην G1242 [COVENANT / TESTAMENT / WILL] πολλοῗς G4183 [MANY] ἑβδομὰς μία G1520 [ONE SEVEN] καὶ G2532 ἐν G1722 [IN] τῷ G3588 ἡμίσει G2255 [HALF] τῆς G3588 ἑβδομάδος [SEVEN] ἀρθήσεταί G142 [TAKE AWAY / CAUSE TO CEASE] μου G1473 [MY] θυσία G2378 [SACRIFICE / OFFERING] καὶ G2532 σπονδή [WITHOUT FORMAL TREATY / IMPLACABLE / WITHOUT TRUCE (/ to cause to cease??)] καὶ G2532 ἐπὶ G1909 [UPON] τὸ G3588 ἱερὸν G2413 [HOLY (things)] βδέλυγμα G946 [ABOMINATIONS] τῶν G3588 ἐρημώσεων G2050 [DESOLATIONS] καὶ G2532 ἕως G2193 [UNTIL / UNTO] συντελείας G4930 [END] καιροῦ G2540 [CONSUMMATION / TIME of the END] συντέλεια G4930 [END] δοθήσεται G1325 [POURED OUT (/ given?)] ἐπὶ G1909 [UPON] τὴν G3588 ἐρήμωσιν G2050 [DESOLATE]
[compare with:
https://biblehub.com/text/daniel/9-27.htm ]
____________
As I've mentioned in past posts, the additional word/s "[prince] THAT SHALL COME" (v.26b) would be superfluous *IF* it were referring to the SAME person as in v.25. (To simply say, "he" or "the prince" [in the next verse] would suffice.) But instead, this is pointing to the one TO COME and aligns with a number of passages I've pointed out with this same "COME" *
idea*, like "whose COMING [advent/arrival/presence/
parousia]" 2Th2:9a (and what that parallels, which I won't go into in this post).
This passage is also SEQUENTIAL. Meaning, after the first one [messiah] is "CUT OFF" then later the city and the sanctuary are destroyed [70ad events] and then later after that is the "FOR ONE WEEK" thing [involving 'the prince that SHALL COME'].