This cat is, I think, a mosaic. Mosaics are chimeras, i.e. organisms with two different sets of genes depending on where you test them, usually due to absorbing a twin as a fetus. This is basically two cats Frankensteined together in a very spotty, patchwork manner, at least if my suspicions are correct.
I love this video because it’s one of the few ones I’ve seen where an animal is being messed with using a holiday prop and is totally okay with it. This is a super happy, relaxed cat who really does enjoy the skriches and does not appear to be bothered at all by the fact they’re coming from spoopy decorations and not living human hands.
Bonus points because the person doing it is being really gentle and calm.