I heard that too about backwards time travel. I'm not going to pretend to understand the physics of it all, I'm too dumb for that.
Honestly if I was going to time travel, I'd just want to see what the world would look like past my lifetime, so like at least over 100 years from now. As sad as it sounds, to see what video games would look like as well. That would honestly be the biggest one for me. I couldn't even begin to imagine. Eventually they will reach a point in graphics I feel like where it's hard to distinguish it from real life. Even now photo realistic graphics can be achieved in Unreal Engine for example but obviously that's just walking around and no gameplay as such.