I like the 8-Bit Guy's videos, so this one is really disappointing, and perhaps eye opening in all the wrong ways. It was unnecessary too; he could still have done a video showing the system, the internals, etc, and just said he wasn't going to attempt a repair because he didn't want to risk further damage. IMO when it comes to repairing rare items, if you don't know what you're doing, leave it to someone who does. My main beef is not just that he doesn't do that, but how unnecessarily careless and either lazy or rushed he appears in general in this video. The whole thing has an air of "I don't particularly care about this, but I need to get a video out", an impression reinforced by him mentioning the two hour car journey and "wasting time on the power supply problem". Oh, and apparently not caring enough to order some security bits and the correct type of fuse.
I wouldn't be irritated if this was just some common hardware that he'd bought with his own money, and nothing of value was lost. However, this is apparently rare hardware that he likely wouldn't have had access to if he wasn't a high profile Youtuber with a reputation of being some kind of authority, and there's no indication that he actually paid for it. He didn't fix it, make any real attempt to, or even really give any indication that he would have been capable of doing so. Instead he carelessly further damaged a rare piece in ways that could have been trivially avoided.
As for the PSU, that could have been easily avoided if he'd just paid attention to the colour of the insulation on the wires that attach to the monitor. They're not random, they're Euro mains colours, which he would have discovered had he simply Googled them. Had he done so he probably would have realised that there was potential for a dead short between live and neutral, and the paper clip trick was unwise. Besides, while ATX PSUs can be shorted to fire them up, they're shorted in a specific way for a specific reason that's not going to apply to most other PSUs. Applying the same method to jumpstart something which isn't an ATX PSU, and shorting pins where you have done no research to determine their function, you have no clue what the underlying fault is, and there could be mains voltages involved, is reckless rather than naive IMO.
If I can give him credit for anything it's that he posted the video. I certainly wouldn't have, but then again, maybe the revenue is worth the backlash.