What did they do to siamese cats?? I had one 40 years ago and it looked nothing like that outside of the coloring.
A lot of inbreeding, and it’s ruined them, imho. That’s what they’ve done with purebreds for years. They’ve done the same with purebred dogs, too.
They look like adolescents. Our big guy looked just like that until his last growth spurt when he turned dark gray. He was almost pure white other than ear and nose as a kitten. He has also gotten massive.
The breeders did that to their heads. They don’t look like the ones I had as a child either. I’ve had a couple since then, lost all their teeth because there’s no room for them with such wedge heads. Now that’s in the breeding, sad to say. The old style apple heads are making a comeback, I have one now, rescued from the SPCA of all places.