What you are looking at is real: the map, the agent and his animations are the game's own data, running in your browser. The match itself — five bots on Dust II, the bomb, the rounds — is playable already, but not ready to hand out yet.
Leave the tab open a moment and watch him breathe. The full thing is coming.
A fan project made for the love of the game. Not made by, affiliated with or endorsed by Valve Corporation; Counter-Strike and CS2 are their trademarks.