. . . with all do respect, Master...it looks to me as if the leading is pointing 45* out to the right, which actually indicates angled hinging. Or is it just the photo that cheats the eye.
There may be a camera angle issue for you. Let's look at the question (of Clubface alignment) another way:
Imagine that Steve raised the club just slightly so that the shaft is parallel to the ground. Then, would the toe of the club point straight up (leading edge vertical to the ground, i.e., the horizontal plane). Or, would it be at a slight angle, i.e., vertical to an angled plane? To my eye, the toe would point straight up, and that indicates Horizontal Hinging. You may see it differently.
At the very least, I think we can agree that the Face of the club would not point at the sky (which would indicate Vertical Hinging).