Proof?
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He deleted his Patreon on new years after months of no updates or communication. Game is marked as abandoned on F95 as well. Also, if you look at this itch.io page, a lot of stuff got removed. It's unfortunate since this game had a ton of potential but it is what it is. I bet the dev got tired of working on this game.
Realistically, he probably released the last update that took him a long time, and his downloads were crappy. It probably cost him a lot of time and money and barely anyone played. I have been in that situation. Demoralized him. Thing is I have never heard of this game, dev didnt make enough effort to get the game out in front of people. This is/was a really gem of a game if he would have actually completed it ;/