They are absolutely completely and utterly bullshit. Nobody with half an ear for music will mistake my playing of Bach's G Minor Sonata with Arthur Grumiaux (too many out of tune notes :-D). But yet, YouTube still manages to match this to my playing, probably because they have never heard it before now (I recorded it mere minutes before).
So no, it isn't a valid claim, but this algorithm trained on certain examples of work, manages to make bad classifications with potentially devastating ramifications for the creator (I'm not a monetized YouTube artist, but if this triggered a complete lockout of my Google account(s), this likely end Very Badly).
I think it's a very relevant comparison to the GP's examples.