It's crazy that someone can accuse you of copyright infringement, yet offer zero detail about the nature of that infringement, and it's up to you to guess what the accusation may refer to and then defend yourself accordingly.
Yes, it may be a case of AI/bots scouring the internet for matches, but then why did Sony not make a claim against the original, untouched sample, which is also on YouTube, on the library's own channel?