Imho, what he did in that video was a terrible way to deal with this situation. If that was me, it would make me want to kill myself even more. I imagine they immediately locked him up in a psych ward, but preventing suicide by force is not really a good idea imo. Is it better to be alive against your will and totally miserable, or able to make the decision to end your own life (and your misery) when it gets to be too much for you? Honestly, I don't know why suicide is seen as such a bad thing. I understand the desire to preserve the lives of your loved ones, but from the suicidal persons perspective, this just feels like a trap that prevents them from doing what seems to them to be the best solution. If you're willing to kill yourself you don't CARE if you're dead.
I know in some cases people get better and then its great because hey, they can live a good life now and they didnt have to die. But some people dont get better. Some people dont care to wait until they can. Some people don't WANT to get better. Some people dont have anything to even "fix" but just dont want to deal with life if they dont have to.
My ex was forced against her will into a mental institution by her family right when we started dating because of previous suicide attempts, a self-harm addiction, eating disorders, etc., and she genuinely enjoyed the experience. So I'm not saying places like this are bad, they're good at what they do in a lot of cases. But its pretty hard to make a permanent impact on someone. In most serious cases, the issues will just come back.
If someone you love tries to kill themselves, I understand that you WILL try to stop them and that this definitely seems like the right thing to do, I've done it and I feel like I did the right thing, its normal for us to think "death = bad, alive = good." But from the perspective of the other person, this idea that suicide is terrible just contributes to the feeling of helpessness. It's like, "I hate my life and myself and I can't fix it, nor can I take the only way out because then I'll hurt everyone I love."
I realize some of the stuff I said is a bit contradictory, but thats probably due to the fact that what a suicidal person genuinely desires and thinks is best for them contradicts what humans typically feel to be "right," so its hard to give my stance (which im not entirely sure of) coherently without flip flopping between both sides of the issue.