I don't think that he takes his clubshaft more inside on the backswing if you view his swing from a DTL view (seen from the front).
Image 1 is his clubshaft plane at address. Image 2 and 3 show the clubshaft plane during the backswing with image 3 showing the end-backswing clubshaft plane. Image 4 is a composite image of image 1 and image 3.