I would argue that one could complain about the vast majority of images on that page as also depicting some sort of Mexican stereotype.

Indeed, your example explains what's going on perfectly.

Generative AI images are "plausible description generators" with a human in the loop.

They aren't trying to draw something, they're trying to get you to call what they draw something.

Given a prompt from a human, they produce an image likely to be labeled as such by a human.

"Well sure that's a Mexican person but I meant..." is not a valid caption.

Yes variety but lots of sombreros and maybe 50% dressed for day of the dead