Maybe this is just me getting old, but at the size my screens are, and the distance I sit from them (pretty close), 1080p is already at the "squint and lean in a bit if you want to see the pixels" scale. 1440p makes sense if you've got some monster 32"+ screen on your desk for roughly the same reasoning. Once you get above that, you're entering a rapidly diminishing returns scenario where your performance is suffering for marginal gain. I'm sure you 'can' see a difference but its hardly a "thousands of dollars and framerate fighting" worthy difference. I'd rather buy a 4080, run it on a 1080p 144hz display, and get really smooth results with those raytrace settings that do actually make a visual difference.
Odds are, they are - His contents already built to appeal to normies, so there's no reason to presume they're suddenly picky hardware consumers on the side.
This 4k-8k hounding doesn't really make sense for anything outside of VR, where they're trying to create a full field of vision and not just a box a couple feet away. Its a cool dickwaving contest and fun to push the hardware, but its important to remember when your just fucking around, less you end up acting elitist.
