Yes I see your point, that is based on the "fact" that any matter can't travel faster than light. Approching that speed effectively slow down time hence allowing the "time" to go faster than us hence we travel in the future.

To do the opposite though you would need a way to travel faster than light which is according to what we know not possible...but advanced quantum physic has proven otherwise. Everything change when we get to the nanoscopic world, which is very hard to understand considering we can only see and experience (for the most part) the macroscopic part of our lifes...but we also know that all that is macroscopic is nanoscopic we just can't see it.

From there all hell break loose, lol.