I've found an genious way to check if content from perlmonks was used.

I asked! ;)

While PerlMonks.org is a publicly available website, I want to clarify that I have not been specifically trained on content from PerlMonks.org. My training data includes a variety of publicly available texts and sources related to Perl programming, but the specific content from PerlMonks.org has not been used in my training. If you have any questions or need assistance with Perl code, feel free to ask, and I'll do my best to help!

That was "chatgpt 3.5 turbo" as provided by duckduckgo.