I think whoever wrote this article mistook the fact the project itself is only fully supported on Linux, but possibly can run on Windows with use of the WSL (Windows Subsystem for Linux). These are system requirements for the host PC, not the in-game computer. Good luck running modern linux or windows on 96kb of ram.
I saw the original author's video and it didn't say anything about running Windows or Linux, hell in fact the "computer" was taking 40s to process a single step from Conway's Game of Life.
The author said that he had developed a compiler for the computer so maybe someone developed a Linux/Windows thing for it? Doubt it tho
I started working on a similar project about a year ago, except I was doing it fully by hand in the vanilla game (journey mode in a blank world), custom 8-bit instruction set, all that. I took an extended break from the project and kept thinking "this idea is so obvious, someone else is gonna do it first and I'm gonna look like a copycat" but not getting around to finishing work on it anyways. I'll post pictures if anyone is interested, maybe a world download if I can find somewhere to host it.