Well, at least Intel acknowledges, documents and finally fixes these CPU bugs (via microcode updates).
AMD on the other hand doesn't even acknowledge an issue
when multiple customers report problems. See this Ryzen bug:
https://community.amd.com/thread/215773
AMD will use the same die for its server CPUs, so ECC support is on chip anyway. I see no reason why they should turn it off in the Ryzen CPUs launched today.