All of that is talking about Trunks' future, and the present, which are two different universes.
We're saying Trunks' pas actions, and he himself, should have never existed if he was destroyed in the past.
And lacked a time ring to protect himself.
Or maybe I agree with what's shown and I'm not about to pretend it works in ways that demonstrably, consistently, 100% of the time, doesn't and never has.
He must use the EE, if the EE never happens, nothing will happen. Retroactive hypotheticals isn't how it works, I shouldn't even be humoring you.
And? Based on what? If it's the scans Luffy posted, you're completely misunderstanding the problem, as those scans all talk about the past and future, in the sense of divergent timelines, not the exact same timeline.