NVIDIA doesn’t support qualification/verification/validation of platforms via these forums, so anything I say here is for general information. It should not be construed as any sort of approval of what you are doing.
P2P communications have historically “not worked” over QPI. It seems evident that you have one GPU plugged into a PCIE socket attached to one CPU socket, and another GPU that is plugged into a PCIE socket that is attached to the other CPU socket. That is what the tool is saying, anyway (SYS). If that is not the case, then nothing is working correctly and I refer you to the first sentence in my response here. In later Intel systems, there are some cases where P2P can be supported across UPI.
Since you are getting a “CNS not supported” message, its entirely possible that the tool is unreliable. I refer you to my first sentence. “CNS” means that the driver doesn’t recognize your chipset (the core logic integrated into the CPU) and so P2P generally wouldn’t be enabled/won’t work.
There is no public list of supported processors for P2P.
All of these inquiries should be directed back to the provider (OEM) of the platform.