We are talking about video poker here. Statistically impossible - the house gets 0.5 - 2% of all money over time at the video poker machines - and that is if you play it perfectly.
Paddock was laundering money through the casino and getting back 97 cents on the dollar playing video poker, 5 hands at a time. A small price to pay for clean money. How he was making the dirty money is unclear.
I don’t think that is actually true, there are machines that will offer an edge if played long enough, and played perfectly. There are also bonuses and drawings that are offered by casinos that can more than cover losses on the machines, and we know from at least one eyewitness that he would take advantage of those.