It was very interesting to read that story but we already knew almost all off it .
Its very possible that he can use that exploit on other sites to , cheater using that exploit is very hard to catch . Not possible without investigating database very closely . And even than its hard to prove that cheater is using that exploit.
But yeah, good to see that pd paid out 2000+ btc without any problem.
Max payout on pd will also be back to 40btc very soon so i guess they already earned back that 2000btc.
EV is 10000+ btc for pd , so pd should be in solid profit even without that 2000 btc that huffle got .
Actually many sites have the delay on changing the seed, typically its about 5-10sec per seed change. I knew that was the problem/exploit when they fixed it in pd after hufflepuff