Fully agree. There’s no U-turn, just reverse the winding sense/direction crossing over the previous turns and then continuing until the secondary turns are all made.
I think the U-turn would surely cause unwished effects because the current would flow in the opossite direction to that on the primary 4 + 2 of the secondary start, thus cancelling the magnetic flux.
Well, I may make one myself one of these days to compare it with the 9:1 I currently use.
73,
Guru