I think I misunderstood that yes.

https://storage.googleapis.com/pub-tools-public-publication-....

TLDR: It's technically CP, but google claims partitions are so rare people can assume it's CA as well (99.999% available).

I assumed TrueTime bypassed the CAP theorem, but apparently that's marketing bs. It's to ensure something called external consistency, which is important if you want to take consistent snapshots over a distributed system.