For more context see the Cornell article from last year

> The first email, sent on May 8 from Cornell International Services, stated that his immigration status had been terminated by the federal government. The second email, sent from Google on the same day, notified him that his personal email account had been subject to a subpoena by the U.S. Department of Homeland Security on March 31.

https://www.cornellsun.com/article/2025/11/immigration-autho...

Basically he was a British national with a student visa who was going to be deported for pro-palestian activism (under Trumps executive order mandating immigration authorities to do so), so he self-deported. Other's mention in the thread it's not clear if Google handed over any information.