hmm... I'm tossed about how I feel about this because I can kind of see two sides to it. Yes, the investigators should have done their due diligence to make sure they had the correct place. In fact, from your article, they did. What they didn't know was that it was old information.
But they can't go to the door as you suggested because then it would tip off the suspects and whatever time and resources they had put into the investigation starts over.
There is a reason for no-knocks...because given the situation (drugs) there are usually weapons involved. The element of surprise cannot be discounted. Our law enforcement is made of men and women who want to be safe too.