It could theoretically print an infinate diameter cylinder if it could drive AROUND the printed piece, so not moving in only X/Y but rotating around the centre of the cylinder.
That said it is still largely useless or at least there are much better ways of acheiving whatever it is the designer is trying to achieve.
Seems like a lot of recent 3D "Developments" are exercises in doing something just to see if it can be done without any consideration for need.