First spotted by Valve-focused Twitter account wickedplayer494, it looks like a playtester for the unannounced Valve shooter Deadlock has made the game visible on SteamDB via the site's token dumper feature, allowing anyone to see Deadlock's player count, update history, and other details.
Valve has still neither confirmed nor denied the veracity of the numerous alleged Deadlock leaks we've seen over the past week. Having been through the NieR Automata Secret Church Saga, I'm not clearing them as 100% legit until the big V weighs in...