Are you aware of the timocharis thread on that wind, that has an explanation of it:
Winding Half-Parallel dLRK Delta - http://www.rcgroups.com/forums/showthread.php?t=1249657
It is a wind that works very well on this motor. I have done three of my DAT-750's with it. As far as explaining it, I'm at a loss on that.
One point of confusion on it for me was that if you do a 20 turn wind Half Parallel dLRK wind you get the Kv that you would get from a 10 turn dLRK wind. So most of the winds that were used on DAT-750's were around 20 turns and terminated "Y" to get Kv's down around 800 or so
The attached image is the one I use, it was posted by Truglodite. There is another image for it around that manuel_v did that brings the motor leads out better if you are going to do a Delta term version.