Your claim is 100% "False"!
The scripture states (Seventy Weeks)
If Daniel meant 490 years he would have written
(Four hundred and ninety years), simple!
Daniel had no restrictions in "Writing" exact numerology as seen below.
Daniel 6:1KJV
It pleased Darius to set over the kingdom an hundred and twenty princes, which should be over the whole kingdom;
Daniel 8:14KJV
And he said unto me, Unto two thousand and three hundred days; then shall the sanctuary be cleansed.
Daniel 12:11KJV
And from the time that the daily sacrifice shall be taken away, and the abomination that maketh desolate set up, there shall be a thousand two hundred and ninety days.
Below in Daniel 10:2-3 we see just another example of Daniel's literal weeks, as Daniel mourned and fasted for 3 literal weeks or 21 days.
Daniel 10:2-3KJV
2 In those days I Daniel was mourning three full weeks.
3 I ate no pleasant bread, neither came flesh nor wine in my mouth, neither did I anoint myself at all, till three whole weekswere fulfilled.