Convincing people to invest in crypto casino projects here, I think you need to explain a little about your project with an attractive design in the form of ANN if you call yourself a representative of a dynamic team.
This sounds better than if we will ask each details in the forum and we might miss out something important or interesting that can lead for a successful deal. If his project is legit, then there is nothing to be fear and hide what is all about. Doing so or hiding it, will only give a bad impression to the people here. You know the people here sometimes, they like to judge things easily 
. Although most of the times their suspicions are also true. Telegram are famous for being a "scammers paradise".. why dit you opt to use that? What other platforms do you use to collaborate with your potential investors?
As you said, Telegram is a dangerous place, so he can just use this forum for communications and also when posting his real identity. I think it's fine because if we can see on other websites, the real identity of the professionals are also being posted there, including their contact details except maybe for their exact addresses, as I haven't seen it yet.