FWIW, I think "inappropriate" is being misinterpreted here. A word or phrase can be semantically inappropriate even when the grammar and spelling are otherwise

FWIW, I think "inappropriate" is being misinterpreted here. A word or phrase can be semantically inappropriate even when the grammar and spelling are otherwise correct, like "most unique" or when it's clear from context that "penultimate" was used to mean "final." All the specific examples given in other comments are about suggestions for inclusive language, which Google calls out separately in the blurb, but Andressen et al are up in arms about "inappropriate words."