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I mean, you're not. Worlds of what? What was the course like? How much time did they lose? Who picked the tyres and accepted the risk - presumably the rider? What was the puncture? How many other racers used the same tyres without issue? Your n=1 one doesn't prove anything, in the same way mine doesn't.
I'm not racing to win, I'm racing for distance/time so there's zero reason to use something slower. If you're riding 25s every week then missing one due to a flat is probably no biggie. On the other hand, if you've flown around the world to race something important and not properly considered the course and tyre requirements, well, that's not the tyre's fault.
Or did he have worn tyres, or crappy rim tape, or the wrong pressure or rode straight into a pot hole/glass?
I think I've DNFd two races in my entire life because of a flat tyre - one was a crit in Oz and a 50mi TT.
Sure, some courses dictate more reliable tyre choice but blaming a specific model of tyre (excluding the whole lot having a manufacturing defect) is almost never correct.