Maybe it is house account of any casino that wanna promote platform on public forums. Maybe he has enough skills making good gambling decisions and he posts on various threads to share his excitement. We can't be sure which option is right, at least he said he going to quit gambling after big hit.
We will never know the facts if he stops gambling until 2023 but I appreciate if he can stop after winning the jackpot and not everyone can stop gambling after winning. I've checked his post so even though it's hard to convince others but maybe he has stopped for a while to enjoy the results of a big win, so congrats to him and maybe he will win higher than 9k in the future.