Yea it sounds like bullshit the way he means it. There are other more subtle ways to take advantage of luck though e.g. If you have recently had a good run of cards (and shown them down) the fish will be more likely to believe you have a hand since you are clearly on a hot streak. Other people will be less likely to believe you have a hand since "he cant have one again". Spotting which type of player is which will probably add a bit of value to your game but its a bit too detailed for my reading capabilities atm.