Yes, I think it's fascinating! It seems to be a new euphemism for "shutdown" that they've been using (perhaps first internally?) for the past year or two.
A few other examples:
https://security.googleblog.com/2018/01/announcing-turndown-...
https://developers.google.com/speed/pagespeed/service/Deprec...
https://plus.google.com/+LesiaSliusarenkoCM/posts/AiyjSfWJjA...