I guess I don't get your point about him being on the spectrum and how that means he accidentally may say offensive things. If that were true, as you say, wouldn't he have realized that in something like this?
I would think so, but I don't speak for everyone on the spectrum. I can't imagine someone in 2017 thinking "hey, lemme write an anti-diversity memo at Google, that'll go over well".
From the impression I've gleaned, Googlers seem to strongly believe what is said in Google stays in Google and people there believe their coworkers are generally open-minded, extremely intelligent individuals. He may have believed he was in an environment where this was not as much of a mistake as it very obviously, in hindsight, was.
