[_cs2017_]

This is incorrect. The data discussed in court is data freely visible on the web, not user data that the users sent to Google.

If the data is sent by a user to sub-unit X of Google, and X promised not to use it for training, it implies that X can share this data with sub-unit Y only if Y also commits not to use the data for training. Breaking this rule would get everyone in huge trouble.

OTOH, when sub-unit X said "We promise not to use data from the public website if the website owner asks us not to", it does not imply another sub-unit Y must follow that commitment.