I think he’s become very wary when it comes to talking about Sterek because of the fans’ reaction. In the past, he’s said things about them that got him in trouble without reason. Fandom reacts very strongly to everything he says.
Take for example this NYCC panel. We haven’t seen the video yet and there are already people convinced he doesn’t want to make them canon, and people convinced he does.
No matter what he says, he won’t please everyone. I think he’s trying to be cautious. First reports made it all sound very positive, last post’s general tone was very negative and pessimistic. At first fans were euphoric. Now they are sad.
Welcome to the Teen Wolf rollercoaster!