I don't know what a reg is but I would assume the first thing you do after you get your bot working is to add some imperfect play so that you don't get banned by the most trivial heuristics.
Yeah. Poker isn’t actually hard to play perfectly if you’re writing a bot. The hard part is making it look authentic and not emit any patterns or other signals that could be detected in the data.
Reg means regular, ie someone who plays a lot. Usually but not always it implies someone who is a winning or at least attempting to be a winning player