I pm'd him a month or 2 ago and he said its still being actively developed. Response was very quick.
Sorry but this isn't good enough.
There are people coming in the slack trying to pretend they got responses from him with insider information and no one can prove it.
Even if he said it's still in development, that isn't saying much if he won't even come on the thread and explain what's going on or message people who have been following the project since the early days.
Have you ever considered that it could be your aggressive attitude that the Dev doesn't respond to?
This guy seems as genuine as they come. There is no reason to slap him down and call him out because
don't believe him.