Sure, some people have no self awareness. In that case you can change your approach, if you are a manager or otherwise invested in the company you can put pressure on them to increase the quality of their work and to own the things they submit. Bring up specific examples of poor quality work, errors in documents/messages, etc.

Or if you don't care you can just ignore this persons messages.

I got sent a 6-page spec document with a footnote that says "this spec was created with AI, so it may have nonsensical sections. Feel free to fix them."

I had someone submit a PR that was 3000 lines of shell scripts. Totally useless crap. I tried repeatedly asking him why he made particular choices and it was so painfully obvious that he had absolutely no idea and was just inventing bullshit answers. I would rather he have just said "I don't know, Claude added that", then tell obvious lies to my face.

And that's the point where you can stop to hide your true opinion, no? "How am I supposed to review a thing the supposed author didn't even read or understand himself?"