Yes, it was a deflection that made him score, and yes, it's still something good from him. Strikers have to be at the right place at the right time, off the ball movement is a skill that Kean has. He finds himself in enough of these situations.
He has a lot to improve, but again, he is 21 and has 2 goals already in limited minutes. I'm not a big Kean fan, but the takes here seem overboard. He is still younger and less experienced than basically all of our team.