I asked Dave about it, and he said it's what GOG reported. ¯\_(ツ)_/¯ Like I said, no reason to doubt him. But it made me a little concerned about GOG because even if it was just a sales dip, it shows an instability with GOG overall compared to Steam. And, even without that weird month, our GOG sales are way down. In year one, GOG sold ~20k copies, Steam sold ~43k copies. For this year, it'll be more like ~2k copies on GOG, ~17k copies on Steam.
Also, I wouldn't say I'm good, I've just been very fortunate with Primordia and the support it's gotten. In general, video game development was a fantasy of mine when I was a kid, it turned into a reality, something that I could do as a hobby while receiving very generous compliments from players, tens of thousands of dollars in what is basically "found money," and the opportunity to work with or at least meet various childhood heroes. As an eight-year-old kid I met Faran Brygo in Wasteland; as an adult, Brian Fargo and I have gotten a few lunches and dinners and chatted about game development. Got to have beers with Ziets, Saunders, McComb, Avellone, etc. and chat about MOTB and Fallout and PS:T. It's all like one of those stories where the hero wanders into a fairy land, visits the fairy king's court, receives treasures, goes on adventures... I keep waiting to wake up beside the cold hearth with nothing but a backache, but in the meanwhile, it's hard not to have a stupid grin on my face.