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.