I thought a bit about what Google's "25% of our code is AI generated" actually tells us: I am afraid not much.
In some ways, all code is "boilerplate" code.
The actual work of a programmer is to choose a certain data structure, or the appropriate algorithm.
So you are right, when they say "25%", they want it to be interpreted as "AI took 25% of the decisions" but in reality it means "it did 25% of the typing", which is immensely lame because I don't use AI and my IDE already autocompletes more than 25% of my typing.
The question I'd ask though is - why would I even believe what they say?
@chrisg That is a good question. I just took their word at face value to show that even then it doesn't tell us anything.