The Blood of the New Covenant Was Spilled in the 30s or in and around AD 70 w/ the Fall of the Temple?

Former Covenant Partially Exemplified by
Moses and David/Solomon : Tabernacle and Temple

New Covenant Partially Exemplified by
No sign of a functioning Tabernacle/Temple

We can see plausibility of blood spilled for a new covenant with the Jewish Revolt more so than in the 30s when there was NO intent by Tiberius to put an end to the Moses-David-Solomon Temple Judaism tradition by destroying the Temple.

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Question: Why must placing Jesus in the 30s rather than in and around AD 70 be considered non-historical when Jeremiah also saw a New Covenant?

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Jeremiah Chapter 31

"Behold, days are coming," declares the LORD, "when I will make a new covenant with the house of Israel and with the house of Judah, 32not like the covenant which I made with their fathers in the day I took them by the hand to bring them out of the land of Egypt, My covenant which they broke, although I was a husband to them," declares the LORD. 33"But this is the covenant which I will make with the house of Israel after those days," declares the LORD, "I will put My law within them and on their heart I will write it; and I will be their God, and they shall be My people.…

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