This is referring to what you need to win to make set mining a profitable move. You need to win at least 8 times what you put in to break even, but this is only in theory. You will make your set 1 in 8 times roughly. But you need your opponent to stack off, and as this is not always gonna happen - as well as the occasional obvious flush or straight where you may need to fold - you need better than 8 to 1, so 12-15 to one sounds good to me. It depend on how you view a lot of things, like if you think you can outplay your opponent post flop, you may play a PP differently than if you think your opponent is gonna outplay you. So if you have 22-77 (my idea, some go 22-66 or 22-88, whatever) your opponent needs to have enough in his stack to pay you 12-15 to 1 in case you make your set. So if you have 20 BB, and your opponent has 9, it is not going to be profitable to set mine. But, then again, this is not written in stone, it will always depend. But those odds
sound ok to me.