The only method I’ve seen work semi-reliably for archiving console game source is to grab the physical machine that made the final build, spray paint “Do Not Dispose! Build archive!” on its side and stick it in a back room. Even that has a 2% chance/year to end up in a dump.

Otherwise, console game build systems were far to finicky to repro later (at least up to the 360/PS3 generation). You would need a huge collection of confidential tools from the manufacturer and those tools sometimes had OS/driver/hardware dependencies that can be reproed reliably with a VM. Think USB driver for the GameCube debugging connection. IIRC, the PS1 and N64 required add-in cards to connect a PC to them. Then there was the propriety test disc/cartridge burners.