Can not confirm nor reject the claim because everything is so tiny and fast moving. Many (apparently archived) post are in Arabic, so I cannot make head or tail of them.
The only thing I can confirm is that Taleb A. was active on Twitter long before 2024. So obvious his posts were deleted. But what they contain or was he a fan of Elon or not, I cannot say. And the author of the twit neither.
As you well know, because Musk is a free-speech absolutist/crusader. Actually so much so that he is constantly attacked, and vilified for his courageous position. He is also a bold defender of the light of human consciousness itself. So working backwards from there you can determine that deleting posts is actually a form of constitutionally protected speech which X (the everything app) is doing, as a public service for all of humanity.