AAQ,
It was common to count the years from the beginning of the reign of the king (or president, PM, etc). See the Gemarah in Rosh Hashanah.
The issue of replacing one king with another king when they assume the throne is not a problem.
But, Yezus is not a “King” like Biden.
Yezus is the “King of Kings & Lord of Lords”
So it’d be improper & blasphemous to replace him with a “Regular” King.
(How i know all this? Don’t ask:-)
