It isn't a statistical anomaly. He has a huge bankroll and thinks that the range from min bet to max bet is too high and allows players to successfully martingale if they have a big enough bankroll.
What do you think about that? Martingale is a losing strategy, no matter what your limits, in my opinion.
I agree with Dooglus. Nakowa was very lucky, he could have just as well ended up losing it all. There's no way you can know when to stop with martingale. Furthermore, I think that even with the profits disappearing, it was an excellent day for the site. Dooglus has once again proven to be trustworthy. That will attract other whales in the future.