I want to say they announced this game at least 3 years ago?
3 years, and then some...
Deadhaus was announced as a project in development 5 years ago (with most concept art and very, very prelim footage,) and they launched a social campaign for people to develop it's progress. Then it was promoted 4 years ago as a flagship title in part of the rollout of the open-source'ish O3DE engine (Deadhaus was first on Amazon Lumberjack, which was used to spin off O3DE, and both have roots in a years-old version of CryEngine but with its own development fork separating it at each step.) Shortly after that event, the studio swapped engines to Unity, and now this is 'announcement' trailer #3 or #4.
2021 Teaser
Before all this, Dyack had different studios and Kickstarter initiatives doing something called Siren in the Maelstrom (which I kind of remember was pitched as also being a little like Blood Omen?) and also an Eternal Darkness spiritual successor called Shadow of the Eternals and other stuff. Some of these projects, you may have heard about in the past, but nothing came of those; Deadhaus is now Dyack's focus.
Kooky history, and to me, it's not showing the half-decade of development, engine swaps or not. Then again, RPGs can have more than meets the eye, so hopefully there's unseen qualities beyond whats being made fun of here. Or not? I don't know, good luck...