Did he. The way he presents is very odd. Lots of assumptions with no evidence presented. Reminds me of the YouTubers with the "there might be, is it, it could be, apparently, maybe, who knows, some say, but Idont know anyway, claims. Odd.
Anyway I'd wait for a better source than him on if they are used and when. For clarity a bit of information:
"International law does not prohibit the use of thermobaric munitions, fuel-air explosive devices, or vacuum bombs against military targets.As of March 2024, all past attempts to regulate or restrict thermobaric weapons have failed.
According to some scholars, thermobaric weapons are not intrinsically indiscriminate by nature, as they are often engineered for precision targeting capabilities. This precision aspect serves to provide humanitarian advantages by potentially minimizing collateral damage and also lessens the amount of munitions needed to effectively engage with the chosen military goals".