They say it’s riscv, but also can run parts of windows? Since when can Windows run on RiscV? Do they mean via Wine?

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.