It could just be as simple as the Jays thinking anything starting out high is a fastball and they’re giving up on it early, just to watch them plunk in, and not really trying to identify the pitch. He could be tunnelling so well off the fastball that his curve is really hard to pick up.
At least that’s what I’m going with right now since it gives credit to the ace rather than just assuming the Jays are horrible at pitch recognition.