I don't think I'd clock the ramen one as AI, if not for the main image being AI generated.

The one thing that strikes me as LLMesque is the occasional use of random and seemingly inappropriate symbols. For instance the lightning bolt and then the arrow/square by the order ahead label by the start an order button. It's also placed in a slightly odd location. The symbols at the top are also kind of weird. I think it's the LLM trying to allude to the cyberpunk theme, but it does a poor job of it in a way that even a low skill human probably wouldn't - because you just wouldn't think to put a part of a rectangle up there beside a checkerboard pyramid thing.

And that contrasts to an extreme degree against the rest of the scene which flows extremely well, maintains perfectly color coordination, and so on. I think it's kind of like how self driving cars can drive phenomenally well but then have occasional failure modes like randomly driving head first into a concrete divider. It's not like that's bad driving in the sense of missing a nuance, but something that's just completely conspicuously outside the rest of its demonstrated abilities.

I'd clock this as an AI website with no question whatsoever. Everything comes in punchy threes. I don't need to know what "早い・旨い・熱い" means in order to smell it for what it is.

They both read as hyper-polished pastiches of existing, well-established aesthetics. The cyberpunk one in particular employs just about every genre trope I can think of. There's no sense of stylistic ingenuity or choice - e.g. deliberately breaking from convention or leaving things out.