The github link on there is dead, and I don't see any statements regarding provable fairness.

How does provable fairness work with multi-player poker? In the blackjack case you can reproduce the cards based on the seed, but with poker, that's not sufficient (nor helpful, you don't want hands exposed after the game).

You'd need to prove that the server operator didn't collaborate with any player (simply telling a collaborator the hands of the other player), and that players don't collude (sockpuppets).