Oh awesome. That's really fantastic.

The Riptide motherboard I use also has ECC listed now. https://pg.asrock.com/mb/AMD/B650E%20PG%20Riptide%20WiFi

"Supports" might mean you can run unbuffered ECC UDIMMs but without ECC? Even Intel can run ECC UDIMMs in non-ECC mode. Also some manufacturers don't distinguish between "on-die ECC" (DDR5) and real ECC.

No, the memory controller believes ECC is activated. See my post :)