That's just it, you DON'T see what they're "doing" - and one can easily cause a short to make the PSU blow. What was the "draw"? It wasn't running a MB AFAICT - since the P4 wasn't connected.
Naturally THEIR power supplies, not shown testing in the video oddly enough, don't have this problem..... Riiiiight.
Hey. You aren't allowed to ask questions or question their methodology. You MUST take their word for it. They wouldn't lie to you.