Well, my description is slightly incorrect. It has been a long time since I saw him. I just reviewed a video of him playing. You are right, he does manipulate them from the left. What confused me is that they go all the way through and so they are visible on the right side.
His harp actually doesn’t appear to actually have bridge pins, and the bending mechanism is only on certain strings. Otherwise it is still basically correct. The string runs up the middle of the top piece and the bending mechanism is basically a bar that runs through that he moves to press into the string.
Here is a good video that shows not only the way he uses the mechanism, but also the use of a “utensil” to alter notes.
I think it is worth noting, also, that the plays on wire strings, which I am sure has an impact on how well his techniques work.