happycakes: The confusion comes from the lack of comms from devs partly because of the way GOG works you don't get a newsfeed for the games you own. The other thing is they posted instructions for steam. We're just assuming it works the same on GOG, which is a safe assumption, but it would be nice to have some certainty.
StingingVelvet: The same news stuff is on their website, it's just copied over to Steam. As you say, GOG does not have a similar function, which is why it's not done here. The website prominently displays GOG's logo on the front page, and all news applies to it.
Yep, I ended up going to their website and seeing it is in fact coming out for GOG/Steam/Geforce now, so that's a definitive answer. But they haven't specifically called out GOG to go through the same uninstallation process which leaves a question mark