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so you are already existing since 2015 do you have an old thread here why are you promoting your online casino software just now, when you are already live since 2015, I also did not see any testimonial coming from your clients, or a link to your clients, old and new, there should be clients names on your home page, to make your service legit.
The domain was registered on September 10, 2019. And the day their website was up they had written
2015-2019 
Maybe they moved to a new domain name. And yes, they had the bitcoin casino development feature from the start.
If that was the case this will be incredibly easy to demonstrate as they could point out to their previous website and prove that they are who they say they are, but in any case even if that was the case this is still a bad idea, making a successful casino is difficult and you cannot really rely on someone else to do this job for you, common sense indicates that those people would have made their own successful casino with that software if they could but since they did not then they do not really have a way to help you to make your casino successful.