I don't really understand why "provably fair" would be so big deal. The house is winning always, no matter what. But I don't gamble myself, so perhaps I don't uderstand that world that well.
Provably fair means the shuffle and order of the cards are verifiably random and also that they cant be changed once the game has started. Provably fair means you know exactly what you are dealing with before you start. Game payout odds are clearly displayed in the payout table.
My gut feeling is that since it's using a repeatable number-generator (without which it wouldn't be "provably fair" as you have described), it might be possible to game by client-side pre-evaluation of the sequence. Even if the whole sequence isn't finalized until the initial bitcoin transfer is made (I only have the information provided on the site to go on...), it might be possible (for example) to strategically transfer/commit, at a known/manageable cost, but simply not play the hand (abandon the transfer) unless the payout is greater than your expenses, circumventing the game's long-run behavior entirely. We don't have server code to look at (github?), but we all have access to python's libraries and can seed our own PRNG after the transfer in order to evaluate the hand/sequence.