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?