system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] If Thanos left the 2014 timeline and went to the 2023 timeline in Endgame, then does that mean the events of Infinity War won't happen there with Thanos being gone? This also means = Infinity stones aren't destroyed, Iron Man doesn't die, Cap doesn't get old, and no one dusted.
gpt
Technically yes, but there is reason to believe that that timeline might not get off that easily.

We've learned from the Loki trailers that the TVA exists, and their job seems to be to undo variant timelines. Furthermore, Steve and Bruce believe that returning the Infinity Stones to their proper timelines will "clip the branches" of those alternate timelines from the main timeline. And then there's always the possibility of universal course-correction where if the timeline deviates from the norm, the universe will do what it can to get things back to normal which was seemingly explored in the final season of Agents of SHIELD.

Which basically means that even though this alternate 2014 universe looks safe at the moment, in 4-9 years' time, Tony might still die, Cap might still find a reason to travel back to the past and age, and someone else might cause a universal cataclysm. Or the alternate timeline might just cease to exist altogether.