I haven't watched the entire video but that part about the vram is interesting...
On the 2070 Super, the game for some reason is reserving 1600 MB of Vram for OS/Apps but Alex showed that his OS is infact only using 465 MB. When they tested on the 4090, it's reserving 4850MB of Vram for OS/Apps when infact the OS and background apps are not using anywhere near that. The game doesn't actually scan how much vram the OS/Background apps are using but instead, just has a blanket % depending on how much vram it detects.
There really isn't any reason for the game to stupidly reserve that much for the OS. Maybe on the PS5 yes but not on PC.
PC Specs: CPU: 7800X3D || GPU: Strix 4090 || RAM: 32GB DDR5 6000 || Main SSD: WD 2TB SN850