I have avoided Intel products since the time some law enforcement forensic team used DCILeech to read the RAM of my server hosted at Hetzner and extracted a LUKS key from it. That was a lifelong lesson. There is no guarantee AMD won't come up with similar shenanigans like Intel's DCI soon and of course we don't know what PSP does behind the scenes, but at least for now, they are generally better for anti-forensics-tuned Linux kernels.
All devices have such backdoors.
If you assume the machine will be compromised, is there any way around this?