Well, if there are 40 straight flushes and four of them are royals the ratio is 9 to 1. Whether that's the ratio in your play depends on how you play and your strategy.
The only claim I saw Rob make is something about hitting more royals than SFs.
I went more than a year without a royal several years ago but I got multiple SFs. I remember one time during that no royal cycle being dealt TJQK of clubs on the Rincon progressive and drawing the 9c. As I got the hand pay I said to the floor person I was lucky... it could have been the two of hearts.
Anyway...
Rob makes a statement and you jump all over him for everything he ever said in his life from RVs to losing football picks.
Carry on.