I have the same issue, all my pull requests were closed with the same vague message. Looking through the pull requests on GitHub at least 100 other pull requests were affected, too.
At the same time I couldn’t find any information regarding this mentioned AI text, neither on GitHub nor in the official documentation.
It seems that Epic wants to combat AI generated code in their code (good) but launched a bot prematurely before communicating the rules that this bot would check.
On top of this it’s not even consistent, there are over a thousand other pull requests that are still open, and as far as I could see none of them have any AI disclaimer. Not sure how the requests to close were picked 
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