The vast majority of what's showcased on that site and playlist were done via assembly hacks, not c. Super Mario 64 decomp has only publicly been available sin

The vast majority of what's showcased on that site and playlist were done via assembly hacks, not c. Super Mario 64 decomp has only publicly been available since late 2019. And even then, there's still holdouts as the toolset for ye olde ways has been around longer.