Arguable, I suppose, but it certainly looks like he grabs the neck opening (collar) of the jersey.
Regardless, I'm detecting some folks may think that grabbing the neck opening of the shoulder pads is required - NO! Either the back/side of the neck opening of the jersey, or the back/side of the neck opening of the shoulder pads (or both) qualifies for the illegal horse collar foul (if the other elements are present).