His point, that table selection is extremely important, is a very true one! If you only play with people that are better than you, then it is simple logic that you’ll lose money in the long run.
What’s interesting to me is that this is a point that many very visible/famous poker players seem hesitant to make. A few years ago, there was even this sort of general sentiment among pros that “bum hunting” or seeking out worse opponents to play against was somehow unethical—which I never agreed with.
If you want to win in the long run, you have to play against people that aren’t as good of a poker player as you are, plain and simple!