He also states in the video the textures take up 40mb of the 64mb an N64 cart can realistically hold.
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.