They literally included a screenshot of valve asking to not share information about the game with a little quip about how they pressed escape instead of ok. Blantant disrespect to valves wishes even if it's not a legally binding agreement.
They chose getting clicks over doing right by valve. Shame on them.
20,000 people are playing it at a time. Not exactly a secret. The way they're testing this game is radical and newsworthy in itself. I'm glad Verge reported on it, and they don't seem mad they they were banned