Yes, you are correct.
But
If you are dealing with multi-million time of throwing a dice, the proabability is normalised, aka you throw the dice 10 time, may be you get 50% of 1, 10% of 2,3,4,5,6.
But if you throw 10 million times, then the probability will be normalised, aka you get almost equal chance of 1,2,3,4,5,6.
Basically casinos earn money by having more winning probability than the customer. Just like roulette, casino has high chance of winning, because they pay you 1:36 only but there are 37 or 38 (0 and 00) number available. Occassionally, casino might get more winning chance due to odd and bias of number come out at certain of period, but longer term, the winning chance is normalised.
It is as same with those gaming company that operating 4D.
So basically, why they come out the analyst is because Resort is operating at the same amount of betting that received from the table, but they are winning more compared to previous quarter, so that's why come from the term "better luck". So based on hsitorical data, it might not repeatable (the normalised chance as mentioned), so they expect lower revenue in the next few quarter.
Except Resorts has changed the rule of the game (gambling rule) which is more favour to the house, then those more revenue or "better luck" will stay.
Just like you keep on winning 4D lately, but we know it highly won't be repeatable, although it is still random as previously hit doesn't mean next won't be hitting again.
Hope this help what is meant by normalisation.
Number is random, so does luck, but over large amount of repeatative, the chance is normalised back, although it won't be exactly, still it would somehow skewed at one side, but not that significant compared to a short certain period.