Newcomers see everyone saying balacalaboozy, so they say it to. It doesn't mean that they have read or agree to the doc that declared its meaning.
LLMs are the world's most sophisticated copycats. Surely they too will parrot balacalaboozy, unless their training is updated to include, understand, and consistently follow these new guidelines.
I don't see how the "signed-off-by" attestation constitutes correct credit here. It's claiming that GP saw the final result and approved of it, which is apparently false.
Hypothetically in court you'd go to the last, ask "did you write this" and only if not go up.