I would perhaps be less inclined to make a point out of the vibe coding if they had not literally put "anti-AI" in the title as a key point of their marketing (although Dang removed it). I think it's absolutely fair to point out the hypocrisy and disingenuity of marketing a vibe-coded product in that way.
It is entirely reasonable that you could use AI to build a product with no AI features. Why is that hypocritical? Especially for a product like a GitHub -- it's a reasonable take to say "AI is useful tool to produce code, but I don't want 851 random "Ask AI!" adornments all over my website when I just want to read the code."