Do not pay much attention to the sales figures of SteamSpy, they are simple estimates. They are only worth to get an idea of the progression in the long term and this is still good. Since the game was released on Steam the player base has doubled. As of September the increase was minimal, but since the update was launched, numbers have shot up. It will take a few days to see the trend, but my estimate is that numbers will increase between 5k and 15k. The biggest problem I see in that data is the number of players in the last two weeks because despite having doubled the player base, the number of players is still the same as a year ago.