It was Mark Bryant from Baitworks
I honestly can't see any benefits to the elongated D, I presume its to let the pop up slide back when its blown out, as the bait is a pop up it'll never make full use of the D as the only direction the pop up wants to go is upwards. I think the original chod or hinged stiff rig have been developed to their full potential and this rig offers no more benefits to those but saying all that, rigs are a very personal thing and if it works for him then why not