I can explain a few terms, if you’re interested. I’m simplifying so nobody murder me:

Retroarch is basically a program that lets you emulate (basically make your computer mimic a console to play the games from it) a bunch of different videogame consoles. Mostly old ones, but some newer things like the Switch.

Shaders are complicated to ELI5 but it’s easiest to think of them as a filter you can apply to a videogame in real time, like you would apply a filter to a photo or something. You can get some absolutely crazy effects with filters- generally the simpler the game the more shaders will accomplish.

He’s basically just asking if shaders for old games intended to make things look more like a CRT- those old, gigantic tube TVs- are just nostalgia bait or if they actually make things look better.