Hey EVS,
Well I'm glad your only 99% sure because I am no way 100% sure it's not smoke. But go back to the orig youtube and note how the ring stays in perfect form for so long as the clouds drift by. Also the location is fixed using the drop ride and the trees as a reference. There is no diffusion of the smoke as in the examples you linked to.
Hey numbers, I am never 100% sure of anything, as if I was, I'd hold the answer to all possible questions!

The air is devided in layers, and as long as the ring travels in the underlying ditto, it is keeping it's shape. It's also dependant on the meteorologigal conditions how thick the lower layer of air is, and in which way it is directed. It can easily be traveling in the opposite way as the layer in which the clouds reside.
But, I'll not exclude anything, would be nice to see the travelpath in full. Maybe you have a point.
Notice how long you can follow the jetstream outlet from an airplane, in the high layer of air at appr. 10 kilometers altitude...before it is distorted out of shape, it's much the same, just at a lower altitude.
EVS