It was: "With sufficiently advanced vibe coding the need for certain type of product just vanishes."
If a product has 100 thousand users and 1% of them vibe codes an alternative for themselves, the product / business doesn't vanish. They still have 99 thousand of users.
That was the rebuttal, even if not presented as persuasively and intelligently as I just did.
So no, it's not the case of "both things being true". It's a case of: he was wrong.