Hrmm it's not that much of an error since that is dominated by the /14 and /15 but there's a few /16 that Google uses for itself that aren't in that list. See the DNS TXT records for _netblocks{,2,3}.google.com
Yeah, I limited to GCP rather than trying to pull together everything Google owns for simplicity.
When they shut down GCP in a couple of years, I wonder what they’ll do with all the addresses?