Seemingly, this doesn't fix the tampered game file issue with steam deck users. Maybe it isn't everyone but I can stay in the umbral as long as I want and the crimson reaper will never spawn and I can't go online or get achievements.
It's a pleasant surprise the CI are updating this game after launch considering the original 2014 release was pretty much immediately abandoned. As someone who actually kind of liked the original, I hope people are enjoying the remake.