Yes, let's pretend that leaving a message on their webpage is a completely unreasonable method of asking them a question. Let's also pretend that capitalizing random words will make anyone take you seriously, and draw attention away from how much of an asshat you're being. Sure.
Generally developers use special emails when making projects like this. They dont use a personal one. So if a project is abandoned, they abandon their email. And yes, you have made a mistake, its only natural for people, not meant to be an insult or anything, every one makes mistakes. The person asked if this project has been abandoned, you you said with certainty it has not. Later it showed your only proof for making that claim is the fact that it is a demo, and even put a face palm emoticon as if me and the other person are stupid for asking. Demos are released all the time without the final game being made. We obviously know the game isnt completed, but a game not finished does not the mean the developer is 100% still planning on completing it. Since game production takes time, sometimes creators get busy, their circumstances change, or just lose interest and they completely abandon their work. Also their communication stopped well before the pandemic. Im sorry, but you did not and do not have any proof to your claim that this game is definitely still being produced, so yes you did make a mistake.
But no one is accusing anything, no one said they abandoned the project, all we did was ask if it was still being developed... All I said was that theres no proof or evidence recently that the project is being worked on, so theres no way of knowing, I never said they definitely did abandon it. All i did was state a fact that the patreon, website, and this page seem to be empty for a long time.