I already posted this video, but:
https://www.youtube.com/watch?v=nLtmEjqzg7M
Forget the interviews, if multiplayer was never meant to be a big important feature of the game don't fucking announce the game with a trailer that almost entirely shows coop action.
Edit: To be honest I don't think they outright lied. They probably were very far off (both financially and development wise) to deliver that and the game reeks of something that should be now in early access but it's getting pushed as a full game.