Having heard positive things about caldigit, I got their USB-C Pro Dock and I get frequent screen blanking with my M1 Mac, and often some of the USB ports fail to work. I don't use the ethernet port, but I think it is a Realtek (so likely the same thing the author is complaining about)
I have spoken to caldigit support and so far they have replaced the dock once, and now have gone pretty quiet.