No, he’s absolutely right that if you only play progressive slots, and only ones where the jackpot has reached a sufficiently high amount, you can expect to win money. Of course, you may have to look a long time to find such a machine, and you’ve still got to spend a few hours of your life pumping coins into the machine, and you still might lose anyway. But this is a theoretically valid strategy, while just wandering the casino at random playing whatever machines look fun is a near-guaranteed loss over the long run.
As an aside, I feel like slots are psychologically very different from most other forms of gambling. Craps or roulette players are going for the big dopamine hit of winning big, where slot players seem to want to just zone out and “achieve a lower state of consciousness”, as Calvin said about his Saturday morning cartoons. Like Atamasana’s wife, their goal is to continue playing as long as possible, not to walk away with a profit.