They always have fuses for this stuff. They have fuses for everything. Modern silicon has piles and piles of chicken bits and fuses to make sure they cover all their bases. There is zero chance they didn't have a hard fuse to disable a known controversial/segmentable feature like AVX-512.

If it wasn't desigend to be disabled it would be buried under multiple and multiple metal layers. You can't "cut" it like a wire. Metal layers run all over the place [1].

Therefore it would have a an e-fuse or a regular old 'current' fuse -- which is just passing a calculated amount of current through an intentionally thin interconnect so that it burns away.

1 - https://static.techspot.com/articles-info/1840/images/2019-0...