Ugh. I mean, there's nothing in that post that is objectionable, so retweeting it would be no concern at all but for the author. And just because a person is a holocaust denier doesn't mean they are wrong about Middle Eastern wars.
For me, the bigger question is why they were following that account, and/or why they decided to retweet that instead of what is surely hundreds of other similarly phrased tweets.
Was that on twitter or bluesky, the original tweet? If it was on twitter, maybe the lesson is: get the fuck off twitter.