I don’t think you understand how hypotheticals work. When someone says “suppose X happens”, it doesn’t means X can or will happen. They’re asking you to imagine a scenario where it does happen. How the rules of the universe changes to allow it to happen can be up to you, and there’s many ways that you do it, but some will lead to more interesting thought experiments than others. You proposed a rule change where knowing when/how you die with absolute certainty means being immune to all harm until that point. I don’t think that’s a very interesting scenario to think about, so I proposed an alternative that is closer to how our universe actually world and can simply be explained by very good (or bad, depending on perspective) luck.
I don’t think you understand how hypotheticals work. When someone says “suppose X happens”, it doesn’t means X can or will happen. They’re asking you to imagine a scenario where it does happen. How the rules of the universe changes to allow it to happen can be up to you, and there’s many ways that you do it, but some will lead to more interesting thought experiments than others. You proposed a rule change where knowing when/how you die with absolute certainty means being immune to all harm until that point. I don’t think that’s a very interesting scenario to think about, so I proposed an alternative that is closer to how our universe actually world and can simply be explained by very good (or bad, depending on perspective) luck.