Can anyone help me understand how I'd connect this to a PC? Would I need a GPU with Thunderbolt 4 or does the motherboard need Thunderbolt 4 and the PC somehow magically utilises the GPU via that motherboard display anyway?
If the prodisplay xdr is anything to go by, you wouldn't. That could only connect to PC's with thunderbolt, but because the monitor controls were built into macOS, you couldn't change any settings or use it at its native resolution.
The question is if there is any PC video card able to connect to this display.