Not at all.
Yes, he should buy a PC.
Doesn't work with consoles, they are too weak for that.
This is not possible on the XBOX, i.e. With the current series, they are limited to 60FPS, technically and with the help of the software. The new XBOX generation is said to achieve over 60 FPS
Consoles are usually connected to televisions and they only handle 60 frames per second.
He doesn't make the Xbox do that, but hey.
Set your Xbox in the TV and display settings, the image refresh rate to 120Hz. Assuming you have a 120Hz TV. So a 120Hz TV is extremely expensive.
With the 120Hz you can "force" the 60fps in most games. Example: for my buddy who has the old Xbox One, GTA runs constantly at 60 fps. Fps stutters are rare, which are hardly noticeable. Already 60fps fast games (e.g. Halo 5, Halo MCC, Minecraft Bedrock, Ace Combat 7, Star Wars Battlefront II [2017]) run more smoothly.