It would appear he has a tungsten pointer, I don't think that is hand-ground. A pencil-sharp tip does not hurt anything, you need that for fine detail/thin work anyway. It just won't last as long if you get to standing on the pedal.
The "walking the cup" motion may also be aided by a "weld positioner" which is a slow-mo rotational device so you don't have to stop work like the rest of us mortals to manually shift the workpiece.
That said he obviously has spent a lot of time perfecting his skills.