puts the screens in a row so you can still screen cheat

Sigh.

That means he "happens to have a number of bits of equipment for messing around with video," he said.

This is an important line. It was done this way because they had the equipment on hand, not that they think it's a good solution for anyone else. The bit about replicating their setup is just the author being dumb. You could do this with fifty bucks in capture and output equipment.