Honestly, you might have lost your time reading it, there doesn't seem to be a definitive answer on how much AI needs to be used to be disclosed.
I totally agree with your statement, I don't think people should be afraid of using AI to assist. There is currently no nuance between entirely wrote with AI without human involvement and assisting with code. Not in the guidelines at least.
To me, it isn't much different from how i used to use StackOverflow.