I love what he did, but it seems like his recent stuff is only running his romhack. Did he ever make a build of the original Mario 64 with all his peformance fixes, so the original game content can run at 60 FPS on a real N64?
No, and he made a video about it. Basically he worked on the optimizations together with his modifications. He should've done a separate branch on the codebase with only optimizations on the original code
He says he'll port his performance optimizations to the original game once he's done with his game / romhack. Otherwise he'd have to always update two codebases when he finds a new optimization.