That is a ridiculous Facebook post. An embodied soul and its vessel cannot travel to other dimensions. Embodied souls can communicate with and therefore effectively travel to other dimensions, probably only when the vessel is asleep, but they never actually leave the body. There is a concept that souls can be in more than one realm simultaneously. Somehow astral projection fits into all this. I do not see any accuracy in the statement that one can travel too far to come back. So, bottom line, don't fret. Travel as far as you can.