It may not be very relevant. But here is a list of route markers before and after the unaired U-Turn.
Golden dragon: 22.276320, 114.180482
Kung Fu Detour: 22.281267, 114.176702
Shopping Detour: 22.276736, 114.170952 (restaurant); 22.274563, 114.173862 (market)
U-Turn location: 22.279323, 114.181376
The U-Turn location is a bit off the route. Teams had to travel west to do the Detour, then back to the east for the U-Turn, (then west again to do the other Detour if U-Turned), then west again to the snake shop for the Roadblock.
Trust me, traffic is really bad on a Saturday morning in Wan Chai. If you are U-Turned, you would have lost a lot of time only on traffic. I wouldn't be surprised that they have used their EP if they were indeed U-Turned.