Yes, I have indications from a few posts here and Windows itself that I am running in true ECC - 80bit with my UDIMMS - the most recent STH YouTube went in depth about ECC and RDIMM ECC, but based on the 80bits, I know I am good.
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Posted a couple here indicating what HWInfo and Windows says.
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For those curious about power, total system power draw (at the UPS) is 180W with all the hardware in there (HDDs, SSDs) (ignore the Sabrent, it's connected via USB (transferring data from my old server) - (UPS connected directly to my ASUSTOR NAS that is acting as a Network UPS server) - and it's drawing some power on it's own 28-34W or so.
System has been absolutely rock solid with this ram, no BSODs, no random crashes, has been hosting Valheim, Minecraft, 7DTD and CoreKeeper game servers with zero issues.
Cheers