When amd launched AVX-512 support, it was present on all cores of that generation. I think it was zen 3, but I might be misremembering. If I recall correctly it was using 256 bit vectors internally, so full 512 bit operations were slower than intel.

It takes a double pumped approach to use 2 cycle with 256bit wide to finish a AVX 512 instruction. So it sort of does.