@aBav.Normie-Pleb
Thanks for the response!
I was working with Vitaliy (creator of Thaiphoon Burner) to try and figure this out. He send me a couple of debug versions of his tool that gather more debug info, but he wasn’t able get it fixed without Asrock Rack their help 
This was his latest answer:
It confirms that the SMBus controller of your CPU is configured and functioning properly. I have the same SMBus settings absolutely, but Thaiphoon and other software detect all SPD EEPROMs of my DRAM modules.
Well, the BIOS of your motherboard somehow reads SPD information and saves it to DMI tables. As you can see, Thaiphoon Burner reads the part number of your DIMM modules (9965745-002.A00G) from the DMI tables without issues. So, I believe ASRock implemented a non-typical way of accessing SPD on your motherboard model and it is not documented.
@nx2l
SPD reading under Windows doesn’t work on 3.31, which should be the same as 3.30 + a few bug fixes