that website is doing itself no favor. I could read the whole thing and still didn't fully understand what they are selling.
What part of that is hard to understand?
It's not clear at all.
The same developer made PICO-8, which is better known: https://www.lexaloffle.com/pico-8.php
I sometimes think that passionate nerds love their niche so much they forget that other people might not have the foggiest of what they're talking about.
Happens on github README.md files all the time.
https://en.wikipedia.org/wiki/Fantasy_video_game_console
I'm sure you'll just come back and say you shouldn't have to google it. But you have to draw the line somewhere. If they sold Cherry Pie, and you said "what's cherry pie, never heard of it" do I have to define both pie, cherry, and cherry pie? Or is that just up to you to go learn in on your own.