Not sure what you think PPI means or how it’s calculated, but it has nothing to do with being a tv or a monitor. It’s a relationship between the number of pixels and physical size.
A 34" 1440p monitor will have a lower PPI than a 4k TV at the same size
Pixel density is pixel density. Doesn’t matter if it’s a tv or a monitor.
Sure monitors typically have less input lag and there are reasons one might choose a monitor over a tv, but the reverse is also true. I chose a 55" tv for my sim racing setup that sits maybe a meter from my face and there’s no problem with that setup
I just picked up a used RX 6800 XT after doing some research and comparing prices.
The fact that a gpu this old can outperform or match most newer cards at a fraction of the price is insane, but I’m very happy with my purchase. Solid upgrade from my 1070 Ti