problem is demodisk isn't a show focused on running one particular game, they have multiple game demos - all with their own particular quirks and issues.
they could probably make ALL the demos work if they put in the effort(one of my favorite demo disk is lawrence actually attempting to dig into the issue and trying to make the demo work while the commentators get frustrated at the slow progress in the background)
Basically they film the show in an hour - that's all the time they have and their audience comes to them for comedy not forensic analysis of the nuances of game demos meant for older machines running on advanced hardware
also them destroying disks in frustration at them not working is part of the shtick so we can't get too mad that stuff doesn't work