Haven't seen the video but just from the transcript I read it not as asking why you can't generally roll down the windows on an airplane but why there isn't some emergency mechanism to break the seal of the airplane and allow external oxygen to flow in when the cabin is in a low oxygen situation. That there might be situations where maintaining cabin pressure might be worse than keeping it.
But regardless, I don't care much. Even if it was just a stupid thought that popped into his head, I've certainly expressed such stupidity when talking extemporaneously.
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