The N64 lifecycle was only about six years. Homebrewers have had nearly thirty years plus better tools to come up with new techniques.
His approach might be feasible with smaller textures and still represent a visual upgrade over the typical N64 "blurry mess"
At least N64 had correctly-projected textures.
PlayStation had sharp pixelated textures that were incorrectly mapped onto 2D triangles (they didn't account for depth).
So N64 was blurry but correct. PlayStation more aptly deserves the "mess" descriptor.