What I remember is that AMD said that Ryzen supports ECC, assuming that the consumer Motherboard has the extra traces and Firmware support. Since now they are EXPLICITLY saying that ONLY Ryzen Pro supports ECC, it means that AMD may have begun segmenting the consumer platform features like Intel does between Ci5/Ci7 and Xeon E3.
As I have never hear about anyone with a Ryzen Pro, nor a Motherboard specifically for Ryzen Pro features (DASH? The closest thing to a BMC/IPMI in AM4? Where the hell it is, never have seen it working...), is hard to know if AMD is just announcing what features they want their Ryzen Pro know for, and if consumer Ryzen also has them or not but AMD doesn't mention them at all, like the original Ryzens with ECC.
Also, I recall that Patrick at some point did
this rare article on how Intel vPro works for Tom's Hardware, but back when I searched info about AMD DASH, it was a feature on paper that no one implemented. Heck, the article is from 2011 and AMD had already announced DASH by then...