I think the Bitcointalk is just a small percentage of their reach. What I mean is that this forum might not be their main focus probably they are busy on other platforms where they can get more players than here but I think keeping their ANN thread active from time to time would do much good as people will know that they are still active and operating.
Many big casinos promote their site in this forum moreover their site supports crypto payments of course this forum is the market where all crypto people gather here, not sure about social media or other platforms though sometimes outside this forum it's just beginners who don't understand crypto so it's difficult to get the desired target market,
I'm not sure that their casino campaign out there will succeed and become famous, it looks like their casino is not that crowded, it could also be because the budget for the campaign here doesn't exist so they use another platform for campaigning, I even just remembered it again now I think this project has been bankrupt for a long time but still survive there maybe not many active users there, i think they need to run another campaign in this forum to attract new community.