My question is, can he do it consistently?
If not, then its down to what its always down to - luck.
I also agree that luck was involved as it always is. But according to the math after the special rules he negotiated, the house edge was reduced to 0.253 in the early going. Pretty much a coin flip for the player or the casino. So now the amount of luck needed is reduced to the minimum in the early stages, and should the player have his way early on, the house edge needs long term action to regain the advantage.
No doubt he could have lost his whole role in ten hands, but lets not forget with these same rules he beat up 3 different casinos for a total of 15 million. I'd be willing to bet now that no casino will be offering their whales this same agreement in the future.
Regardless of the perks he received, (which no one will ever get again) in the long run the casinos would have prevailed. But at least this incident should be a lesson to gamblers how important it is to achieve perfect play and strategy reducing the house edge as much as possible.
Slot players throw percentage points around like they mean nothing. Many could care less if the RTP's are set at 99% or 90%, in fact most don't even have a clue what online operator settings even are. The difference between one or two percentage points on a slot machine could make or break them.
This is why regulating and keeping online operators honest with enforcement at the least lets the players know they lost their money at the right pace in the long run.