Excellent point. But perhaps they meant "Latin American other than Mexico".
Here in Silicon Valley, there might be Argentinian, Brazilian, Chilean, etc. restaurants that I'm unaware of, but even including the north bay, surely very few.
And in most of America, predictably there'd be none in most towns and cities (aside from New York, Miami, etc.).
Which is pretty different than Mexican, which is indeed widely embraced in one form or another.
P.S. I did just see a new Cuban restaurant in the south bay the other day; I'm not trying to say these things are never here.
P.P.S. a fifth regional American "Mexican" cuisine is, I'm told, found far from the coasts and from the southern U.S. border (possibly especially in the Midwest), "Mexican" almost entirely in name only, which may e.g. use ketchup as the only red sauce, and is often denied to be Mexican at all by fans of the other 4 kinds.
I hear that something similar is what is usually, if not universally, found in e.g. London as well.