Ice Age Maximum, 500 After the Flood?

HGL'S F.B. WRITINGS: Debating CMI's video with Roger M Pearlman · Creation vs. Evolution: Carbon 14 Speeds for Diverse Creationist Scenarios · Ice Age Maximum, 500 After the Flood? · Flood to Genesis 14, Roman Martyrology's Chronology, Two Scenarios (Technical) · What Am I Doing with "How Much Faster" Calculations?

This claim is made around 1:35 in this video:

How Did Kangaroos Hop from Ararat to Australia?
3rd Dec. 2020 | Creation Ministries International
https://www.youtube.com/watch?v=7B5yJjH4J4I

Now, what would this imply? I know from elsewhere that the Glacial Maximum is supposed to have the c arbon date 20 000 BP (memory from CMI, Tas Walker, I think).

With Ussher's time line we get, Abraham 80 years and presumable date for Genesis 14 in 1975 BC, carbon dated as 3500 BC, as per archaeology of En Geddi. However, glacial maximum would be 1848 BC on that view, and therefore the extra years would suddenly have augmented from 1525 to 16 152 in 127 years. With no new C14 formed, the content would go down to 98.475 %, not from 83.154 pmC all the way down to 14.172 pmC.

In other words, impossible.

With a full LXX chronology, we would have carbon dated 20 000 BP before Babel's end, as Peleg would have been born 529 after Babel. Not so im^possible, perhaps, but contradicts their idea of Neanderthal's, carbon dated (when so dated) to between 40 000 and 50 000 BP, perhaps further back too being post-Babel.

What about the reduced LXX chronology of the Roman Martyrology?

Glacial maximum would be at around 2457 BC, 15 543 extra years, 15.256 pmC in the atmosphere of that year.

Genesis 14 would as usual be in 1935 BC, 1565 extra years, 82.753 pmC.

The distance would be 2457 - 1935 = 522 years, leaving 93.881 %. Normal carbon 14 production in that time would be 6.119 pmC points, 6.119 % of what is now the fairly stable 100 pmC.

15.256 pmC * 93.881 % / 100 = 14.322 pmC left

And 82.753 - 14.322 = 68.431 pmC points added, in the time usually available for 6.119 pmC points. It would be 11.183 times as fast.

On that view also it would be hard to have Neanderthals spread right after Babel, right?/HGL