Saying it is 100% sure to happen then going back on it, makes the first a lie. Maybe he did not mean to lie, but that doesn't make it not a lie. It isn't meant to be taken personal but simply a fact of what happened. Regardless, the issue is people still wasted their time on the game base on the information given, still devs don't seem to be considering that at all.
You're focusing on the wrong aspect of the issue, upset people don't act like they aren't upset. You're basically saying it's okay to be mad but not okay to act like you're mad. It doesn't make sense. The issue is of the devs making, don't put the blame on players for the consequences.