I believe there is a Will Self story in which a geological probe reaches the Earth’s core and finds the compressed remains of an American around whom the planet is in fact revolving.

It's not so much invalid as confusing. For Americans to call someone "shortsighted" has a well-known usage and negative connotation about their intellectual integrity. As someone who had never encountered the British usage prior to this headline, I don't think it's out of line to remark on this as a weird curiosity of our shared (but also frequently as in this case not shared) language.

I suspect folks are more irked by the parochial condescension with which the initial complaint was voiced, rather than the fact of the observation. This is not a forum that generally smiles upon weaponised imbecility.

the definition it's literally in every American dictionary though

You need not be disturbed by this. Every nation/culture tends to think in terms of the world "revolving" around them. A people need a frame of reference to view the world that is provided by one's culture. I don't think the OP intented to treat British English as inferior or invalid.