While I kinda agree with the greater point of this, it's pretty disingenuous to say the console is the cost of the console alone while the PC HAS to include a desk, monitor, speakers, headset, etc. The only periphs you NEED for a PC are a mouse and keyboard, which you can get for $20-30 if you don't care for fancy stuff. I read your earlier arguments about not everybody having a monitor and TVs not being normal, but by that metric a very small portion of PS5 users don't have a PS+ subscription and I'd argue half or less don't have a headset, so those would have to be accounted for.
That being said, I still agree with your greater point about price-perf not really being a great metric for PC, especially compared to 2014 when you actually could build a console killer for sub-$500. PS5 GPU is probably comparable to a 2060S or 2070 given various metrics (ik Valhalla seems to imply otherwise but that game is unfavorable to NVIDIA GPUs). Even if you're counting on next gen improvements through Ampere, a 3050 Ti (hopefully comparable to a 2060S) would probably cost $250, which would leave only $250 for the rest of the components and require a good bit of compromise. PC enthusiasts should instead promote the benefits of DLSS, better ray tracing, scalability, and most obviously, productivity and flexibility.