> Or do they have 25% trivial code?

Surely yes.

I (not at Google) rarely use the LLM for anything more than two lines at a time, but it writes/autocompletes 25% of my code no problem.

I believe Google have character-level telemetry for measuring things like this, so they can easily count it in a way that can be called "writing 25% of the code".

Having plenty of "trivial code" isn't an indictment of the organisation. Every codebase has parts that are straightforward.