Net loss means that if you add all the players together, the losses exceed the winnings.
Yes some individuals win (at least occasionally.) But as a group it's always a net loss (because the house takes a cut.)
Yes some individuals win (at least occasionally.) But as a group it's always a net loss (because the house takes a cut.)
He says "The 'house' is the only winner," which is as a point of fact untrue - there are also individual gamblers who are winners. Saying this implies he thinks that each of the gamblers is a net loser.