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Will the deadman's zone theory hold up this time or not? The answer to that question is still to be seen...and I doubt that it is even an all or nothing bet... maybe it just slightly increases the odds that the price will pass through the zone without correcting?
I don't know much about this deadman's zone that you're talking about, it's my first hearing these but I assume that it's a plateau in the market that you're talking about or something like a price ceiling breaking idk. You pretty much answered your question regarding the theory ever holding up in your first statement. New ATH brings new deadman zones which means that the previous deadman zone is broken and that the next one won't be or there's really no deadman's zone, it's just a bunch of people believing that bitcoin will hit X price range but got disappointed because it didn't reach what they expected it to reach.
Of course, every single time that there is a price rise that gets close to or exceeds the prior ATH can be different.