Because the page isn't for all torches, these are the hottest in the world. They don't mention the other Because this page isn't meant for other torches.
That's like me putting in Goku stomping General Blue in his Low 2-C justification.
It's already been done and I'd hate to break it to you bud, we've already created shit that burns at even higher temperatures. The process is hardly relevant, the end result is what's relevant. If that's the only temperature that can manage to do so, and only in small portions then we can logically assume that type of temperature is needed to outright vaporize steel. Akainu did the same thing, instantly and at a much higher degree.
Listen I'm gonna be respectful here, but I'm getting pretty tired of giving you "refreshers." In this thread. I'm not your chem teacher, I don't need to spoon feed you every bit of information like I'm teaching a class. Also what's "I'm not sure if what your saying is true or not" suppose to bloody mean? Because I'd really appreciate if you didn't insinuate that I'm lying. It being fiction doesn't matter, we still apply real world physics to fiction all the time.
And I've already provided information on that. If you wanna ignore it thats your fault, the information is there you just aren't listening to it.
I've already provided a scientific source, stop being purposely dismissive of evidence. I gave you a verified source, the temperature of vaporizing steel requires temperatures of 50000F.