I don't know exactly how they model shuffling, but I know that some players dislike truly random hands, which is why it's considered improper and impolite to do more than 4 shuffles.
This may actually be somewhat of a myth. I haven't verified it myself. I do know that Bridge protocol is 4 riffle shuffles, and typical riffle shuffles don't have enough entropy for 4 of them to randomize the deck (52! ~ 2^225.6, so you'd need 56.4 bits for each, and riffle shuffles have about 30 bits) but I find it hard to envision why this (possibly slight) lack of randomness would manifest itself in higher frequencies of good hands.
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I don't know exactly how they model shuffling, but I know that some players dislike truly random hands, which is why it's considered improper and impolite to do more than 4 shuffles.
This may actually be somewhat of a myth. I haven't verified it myself. I do know that Bridge protocol is 4 riffle shuffles, and typical riffle shuffles don't have enough entropy for 4 of them to randomize the deck (52! ~ 2^225.6, so you'd need 56.4 bits for each, and riffle shuffles have about 30 bits) but I find it hard to envision why this (possibly slight) lack of randomness would manifest itself in higher frequencies of good hands.