I think that's in a C6 A6 / Allroad. The C5 one is smaller.
I suppose its obvious it would deflate itself having looked at the video - the tread surface has to expand considerably as the sidewall inflates, so as soon as the air pressure is released the tread will force the tyre back down to size. Its a bit of an origami masterclass designing a tyre to fold up like an accordion though
