"Our Divine Lord in His Human Nature Is a Jew" (Mgr Williamson is Right)

(OK, I find two quibbles, being by temperament a quibbler.)

The Seven Ages of the World - Bishop Williamson
Fidei Promotor | 21 Jan. 2020
https://www.youtube.com/watch?v=AD-4XYg3trY

1:42 Four thousand years ... based on the Vulgate.

Does it totally trump Martyrologium Romanum which for the distance from Creation to Flood, Flood to Abraham is based on a version of the LXX?

If so, why was the reading kept all the way up to the change of liturgy, which obviously as Trads we refused?

Five thousand years BC, Adam was alive. 500 years old according to Syncellus, 200 years old according to the Roman Martyrology for Christmas Day.

19:13 "one Pagan and one Jew" [Henoch and Elijah]

No doubt, one Gentile and one Jew ... if one can speak of pre-Flood people as Gentiles, when they were before this division.