Are dogs that flexible, though? It seems to me that to bite you when the dog is like the picture that I showed, it would have to lift its front legs of the ground and turn in a full u shape to bite the person.
Yes, they can, that's why they tell you to move them in a circle while having them in the wheelbarrow position, it lessens the chance of them being able to turn back on you. But it depends on the size and shape of the dogs, a dog like chickentrain's Deacon could very easily bite you from that position, while my GSDs are much heavier and longer bodied and it would be more difficult for them to maneuver like that.