While the video is mainly about SV in classic he does briefly discuss later SV iterations. He named specific abilities that SV gained in WotLK because that’s the expansion in which he started playing SV.
Yes, he was correct in the first video. In a later video, however, he claims that SV was always aimed at being melee even since Vanilla. He completely flipped his position on a factual, objective matter.
Yes, SV was the same as MM in Classic. In later expansions it would gain its own unique abilities and would end up being very different to MM. People like Metroid are claiming that even MoP/WoD Survival were the same as MM more-or-less because they both use a ranged weapon. The unique thing about Metroid is that he specifically claimed SV was distinct from MM to the point that he exclusively stuck to SV over MM, but he abruptly changed that position in 2021 as if his own WoW experience pre-Legion never happened.
Again it sounds like you didn’t actually watch either video. He specifically mentions WotLK Survival in his first video and talks about how it was great because it used Explosive Shot and Black Arrow while Marksmanship was just boring Aimed Shot spam. Ignoring the fact that all Hunter builds still took Aimed Shot in WotLK (it was instant cast in that expansion however) evidently he did view Survival as something unique, fun, and distinguished from MM before abruptly reversing that position some time later.