They don't need to, they have their own studio that makes all their emulators called NERD: https://en.m.wikipedia.org/wiki/Nintendo_European_Research_%26_Development
Those emulators most likely have always worked on Windows since they need to be tested somewhere.
Figma has an unofficial Flatpak version available, which is a wrapper for the web version so I can't speak for how well it works but it might be worth to give it a try on your Steam Deck? Just search for "Figma" in Discover when on desktop mode.
https://flathub.org/apps/io.github.Figma_Linux.figma_linux