If supertasks are metaphysically impossible, the premise that uncountably many trials can be completed collapses, and the probability-1 guarantee never applies to any realizable agent.

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Metaphysically impossible(as used in metaphysics): Something that cannot exist or happen in the deepest reality, no matter what—not just practically impossible but impossible by the very nature of how reality works.
Premise: A premise is a statement or fact that you assume to be true as a starting point for reasoning or making an argument. Think of it as the foundation or building block you use to reach a conclusion—for example, "All dogs are animals" and "My pet is a dog" are premises that lead to the conclusion "My pet is an animal." Premises are essentially the evidence or claims you offer before drawing a final conclusion.
Probability-1 guarantee(what stops being guaranteed if supertasks are impossible): A certainty that something will definitely happen; a 100% guarantee with no possibility of failure (in probability theory, 1 = 100%).
Realizable agent(describing who or what the probability guarantee applies to): An entity or being that can actually exist and act in the real world, not just in theory—like a person or robot, as opposed to something impossible.

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