I don't get that from "Whelp, wrong off the bat", which seems to imply that there is a more unambiguous right answer here, and Google is wrong for deviating from it.
Well, even within Google I think this policy is stupid. Any software they make open source or have to port to new platforms that was based on this policy is going to break, and for what? Bashisms provide a dubious value-add.
And posted in a public forum, which is why I made sure to protest its adoption by the broader public.