Lab experiment was ...
1) 2D
2) the motion was directly controlled and forced the entire time (not accounting for the laws of thermodynamics ... stop the devices that were creating the motion and it immediately dissipates, meaning that the lab experiment forced a polygon but did not predict a polygon
3) even with the tight controls, the shape kept changing, and they grabbed a few frames where it happened to resemble a hexagon, i.e. the shape was unstable whereas Saturn's allegedly has remained stable for 40 years
4) no cyclonic structure