>The question of whether Halevi's work had any historical basis regarding the Khazars' conversion to Judaism is controversial among scholars
THANK YOU for posting this.
Too many people just jump on a theory because someone they like mentions it. When that happens, they repeat it as if it is established fact, when it is no such thing.
The poster you are responding to is repeating what was in Arthur Koestler's book The 13th Tribe, who has (and admitted late in life) a definite reason to push the theory as if it was fact: it was "good for" his people.
This has nothing whatsoever to do with Q topics either.