I really hate to say this but it is the easiest scam to perpetrate, promise updates and keep people waiting while milking the patreon subscribers for their money the longer it takes the more money they get. This has been happening with other developers too, I am not saying it's happening here, but 2 years is beyond a ridiculous amount of time.
An honest developer would stop charging his / her subscribers until they could actually deliver anything. I know of developers who do this.
The best way to get anything more is to hit them where it hurts financially and stop subscribing. I think if people are still subscribing now paying a monthly fee, after 2 years of nothing then in reality they deserve to be scammed. Most people end their subscription if they don't receive anything within a certain time frame, or of course if they are being lied to. Regardless I would say by now something is very wrong and very fishy. This feels like a similar situation as milfy city developer dangling a carrot and delivering absolutely nothing for years...and even today still nothing and he still has his subscribers. At this point they are throwing their money into the fire and watching it burn.