True that most everyone moved over to Discord once that became active in 2016--prior to that this was the main place for interaction
(I guess you could post a link to this thread one the Discord, since a good number of folks do have an account here as well)
This year I'm sure the majority came from Dosh's video, with others sparked by just general news of the new layouts and zooming, which youngster helped with in their own video.
There are definitely original X@COM players around, but in that case most were here from the beginning, having just come over from that. It doesn't get a ton of attention anymore after all this time.
Organic discovery on Steam is quite low for Cogmind considering it's a niche title, so interest is generally driven from the various other outside sources.