Looks about the same as spinning by beer in my freezers ice tray for about 20 seconds. I would love to know how long you have to wait until the can of beer won't explode.
It's just a circular vortex in which u~1/r and there may or may not be a solid body core. A lot of spinny vortices are like this.
I'm not sure where they think their rankine vortex is - whether in the bottle or round the outside - or whether they are accounting for friction when calling it that.