Incorrect. Though most of Hebrews is about Jesus Christ's eternal blood of resurrection, the once for all shed blood was His natural blood on the cross.
If Jesus' blood shed on the cross, is His blood being sprinkled today, then Jesus is shedding and sprinkling His blood time and time again.
Heb 10:12
But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God;
Jesus offered His natural body once for sins on the cross, which can only be offered once unto death. No natural body can be shed of blood unto death more than once.
Therefore, the blood being sprinkled today must be the blood of the Spirit by resurrection from the dead.
1Pe 1:2
Elect according to the foreknowledge of God the Father, through sanctification of the Spirit, unto obedience and sprinkling of the blood of Jesus Christ:
Heb 10:19
Having therefore, brethren, boldness to enter into the holiest by the blood of Jesus,
No one can enter into the holiest place through the natural blood shed into the earth almost 2000 years ago.
Is Jesus' blood being shed again, so that He can sprinkle it on you? If not, then the blood of sprinkling is not Jesus' shed blood.
No blood that is shed by sinful man, can save the sinful man shedding the blood. No one getting Jesus' blood shed on them at the cross, was saved by His blood being shed on them as they beat, whipped, and crucified Him.
Mat 26:27
And he took the cup, and gave thanks, and gave
it to them, saying, Drink ye all of it; For this is my blood of the new testament, which is shed for many for the remission of sins.
Catholic communion with the cup having the blood of Jesus in verity, is false. They drank wine from the cup of the last supper, not Jesus' blood, which would have been forbidden by law of Moses:
Lev 17:14
For it is the life of all flesh; the blood of it is for the life thereof: therefore I said unto the children of Israel, Ye shall eat the blood of no manner of flesh: for the life of all flesh is the blood thereof: whosoever eateth it shall be cut off.
Jhn 6:54
Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day. For my flesh is meat indeed, and my blood is drink indeed.
Jesus by law cannot be speaking of His flesh and blood on earth.
Are you drinking the blood Jesus shed on the cross? If so, are you also eating the flesh of His body on the cross?
1Co 2:14
For the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned.
Many carnal minded disciples who believed Jesus was speaking of His flesh and blood on earth, turned away from Him, being unbelievers in His spiritual words of life:
Jhn 6:52
The Jews therefore strove among themselves, saying, How can this man give us his flesh to eat?...When Jesus knew in himself that his disciples murmured at it, he said unto them, Doth this offend you?...From that time many of his disciples went back, and walked no more with him.
If Jesus had spoken of His flesh and blood on earth, then they would rightly have turned from such unlawful abomination.
Jhn 6:63
It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.
Do you drink Jesus' blood?
There is no benefit from any substance, without eating and drinking that substance.
Imaginary faith alone turns the true things of the Spirit, into imaginary and ceremonial things alone.
Deu 29:19
And it come to pass, when he heareth the words of this curse, that he bless himself in his heart, saying, I shall have peace, though I walk in the imagination of mine heart, to add drunkenness to thirst:
For the Spirit to sprinkle the shed blood of Jesus on a cross, then Jesus must shed His blood again and again.
The sprinkling of the blood of the Spirit is the life of the newborn sons of God, not just ceremonial imagination.
Does Jesus sprinkling upon you His shed blood on the cross? Do you drink His blood?
Exactly. No repeated shedding of His blood to sprinkle upon anyone after being buried in the tomb of Joseph of Arimathea.
Your claim that Christ needed a 2nd blood or a 2nd atonement is only imaginary.
The one atonement made was by shedding the Lamb's natural blood unto death on earth, and now sprinkling the risen Lamb's eternal blood by the Spirit from heaven.
Are you being sprinkled and drinking the blood of the Lamb of God?
There is ONE sacrifice, ONE offering, ONE blood, ONCE for all shed on the cross & the Holy Spirit sprinkles the one eternal blood of the risen Lamb upon them that obey Him:
1Pe 1:2
Elect according to the foreknowledge of God the Father, through sanctification of the Spirit, unto obedience and sprinkling of the blood of Jesus Christ: Grace unto you, and peace, be multiplied. Blessed [be] the God and Father of our Lord Jesus Christ, which according to his abundant mercy hath begotten us again unto a lively hope by the resurrection of Jesus Christ from the dead,
No one has the eternal life of Jesus without drinking His eternal blood of resurrection, and no one is born again of the Spirit before His resurrection from the dead.
No man can be saved nor justified by the death of Jesus at the cross.
Rom 4:25
Who was delivered for our offences, and was raised again for our justification.
Are you being sprinkled with and drinking the blood of the Lamb of God?