When I started looking at it tonight, the first thing I did was click on a random past bet to see the roll array. It had 7 6's in it. If it's truly fair, in a 30 number array of 1-6, each number should be represented 5 times.
I'm not saying you're wrong about the skewiness of an entire distribution of numbers generated as you describe, however, if I understand you correctly, the line I quote you on above is completely wrong.
In a truly-fair array of 30 random numbers 1-6, the crucial property is that you cannot predict at all how many times each number should be represented. In a single draw of 30 random numbers, if they're truly random, they might be all 1s, you don't know untill you draw. Now, if the numbers are truly random then the long-term expected average distribution should approach an equal distribution of 1,2,3,4,5,6 as you sample size approaches infinity. But it's simply not correct to say that if you draw 30 random numbers from 1-6 that you can expect to find them equally distributed---that would be a decidely non-random distribution.