ECC is working with AMD if the motherboard supports it, but you can't always be sure that the motherboard does support it correctly. You need to rely on user reports/what the motherboard producer promises, instead of it being a default feature that always works.
Still a lot more than what Intel offers in that space.
I didn't say ECC doesn't work. It is enabled on Ryzen. But it's not something AMD go to the effort of validating to make sure it works properly and it doesn't get support. It's left in there as a footnote for enthusiasts.
