You are claiming humans copy-and-paste copyright headers without copying the corresponding code. To prove you're correct, you only need to show one (or a few) examples of it happening. To prove you incorrect, someone would have to go through all code in existence to show the absence of the phenomenon.
Do you mind showing me some examples of that? That seems so implausible to me
Just for reference, here's another example of AI adding phantom contributors and the human just ignoring it or not even noticing: https://github.com/auth0/nextjs-auth0/issues/2432