I’m not sure that’s how it works. I think we are stuck on this timeline. Can change things in future but not things that already happened or would start a different timeline.
I don’t doubt time travel. I just think if you go back in time and change events or anything it sparks new timelines.
For some reason I’m stuck on the timelines. I guess by timelines I mean infinite earths in the universe. So theoretically you could time travel if you could travel to different earths in the universe at different times of human history and change that earths timeline. Maybe that is effectively time travel.