The 8 DRAM packages pretty clearly indicate you're not getting the extra capacity for end-to-end ECC as you would on a typical workstation or server memory module.
Many mobile devices have on-chip ECC because they have to for signal integrity reasons... technically the Raspberry Pi 5 has ECC too, by that definition!
You're right, I had asked my HP specialist to confirm that it was ECC, and he had said yes, but when I prompted him again on the distinction between link ECC (protects data in motion) vs true on-die ECC (protects data at rest in RAM, much more important), he admitted it was the former and canceled my order.
I now ordered a Beelink GTR9 Pro, which unlike the Framework has dual 10G Ethernet, not the weird 5G flavor. We'll see how that goes.
Ah, interesting. Did you get a ship date? I do like the idea of dual 10G. It would be nice to see a review on how well the GTR9's cooling works and how quiet it is under full load.
So it's not full ECC like servers have with dimms with a multiple of 9 chips with ECC protecting everything from the dimms to the CPU.
Keep in mind the ram is inside the strix halo package, not something HP has control over.