He's using a folk etymology of the word holocaust. He says "holo" comes from hebrew "olah" meaning burnt offering, but ["holos" comes from Greek meaning "whole", and it's the "caust" that actually means burnt.](https://www.etymonline.com/word/holocaust) The hebrew word 'olah' appears [hundreds of times in the Old Testament ](https://www.biblestudytools.com/lexicons/hebrew/kjv/olah.html), but it was translated "burnt offering" most of the time, and I can't find any indication that the English word "holocaust" was ever used like that [until jews superseded the word shoah in the 50's](https://archive.ph/U6ffp) The rest of it seems legitimate, so I'm not sure why he chose to discredit himself off the bat using hebrew.