It's a little hard to know without context. Where did you find this sentence? And what does the ellipsis represent? You are correct in your implication that the 'either' would refer to a previous suggestion of incorrect words. You are correct that that phrase would normally follow another sentence or phrase about errors, and without seeing the context, I can't tell why the author wrote it like that. It is even possible that it was written incorrectly deliberately and ironically. If it was an unconnected sentence, then it would be correct to write 'Neither of the words "absotively … posilutely" are correct English.'