Disclosure: I used to work on GCE.

"Renewable" is a broad set of terms. Importantly from your first link on GCP it says:

> Google is carbon neutral for our operations today, but aiming higher: our goal is to run on carbon-free energy, 24/7, at all of our data centers by 2030.

Carbon-free, 24x7, is a stronger commitment than carbon-neutral which would include using renewable power offsets. Amazon's methodology is at https://sustainability.aboutamazon.com/renewable-energy-meth... which makes this clear as well.