Jamulator did this for NES way back in 2013 but nobody really seemed to care... https://andrewkelley.me/post/jamulator.html There is also Winlator for running Windows programs on Android: https://github.com/brunodev85/winlator Also is the youtube video linked in the article using an AI voice?
The N64 is fixed hardware, so it's a little bit easier. Even so, this project still uses emulation for the RDP. I don't know how it handles generated RSP microcode, maybe it doesn't. A lot of games just used the official libraries.