As a WMG subpage, all spoilers are unmarked as per policy. You Have Been Warned.
Manfred Lorenz faked his suicide.
Manfred had simply moved house, taking the development tools to work on the game himself, and left his boat in the ocean. This explains why a copy of the game surfaced on eBay.90s Retro Gaming FRed, 3D Platformers NZ, Ultra 64 forever, N64 Long Lost Lore, and N64ExcavationMan are family members of Manfred Lorenz.
During development, Manfred gave some of his family members an unfinished build of Catastrophe Crow. They then uploaded videos of Catastrophe Crow onto their YouTube channels.- The fact that each channel put together spells out "Manfred Lorenz"note would seem to disprove this.
This is all an elaborate creepypasta that will eventually lead to an actual Catastrophe Crow with a fully fleshed out, esoteric drama/thriller/horror/comedy story, and gameplay.
It's obvious there's a working game out there that's programmed to behave the way it is in the video. And from what I read, a source code was released. So it seems likely that this could just be a fancy way to hype up the release of an actual game, though I imagine it would be far more polished in both animations and gameplay mechanics.