If he's compiling from windows to windows, target OS shouldn't be a problem. Also, I just had to go one extra click to read Mr-Wiseguy's github 😅
He could also, in theory, use Cosmopolitan to generate an APE (Actually Portable Executable) that will run on linux, bsd, windows and mac. I had to find a video where Justine talks about it to understand how and why it works: it's basically a trick to rewrite the header of the executable, with the real magic being an "optional shebang" that lets both Windows and *Nix run the first bytes.