From what I understand it's a guy who buys from Jeff direct and resells it, not actually Jeff himself.
I spoke to Jeff years ago before he had a 'parts' section on his website. He wanted to maybe sell parts, but he didn't want to deal with questions, emails, packing, etc because he already has so much business from his regular sabers. He mentioned wanting to look for someone to take care of a parts business for him. From talking to him a few times since I believe it's actually someone else 'running' that site.