Here is the type of coating that was put on to give it the low friction effect:

Here the frictionless sphere is a dome of radius 14 cm which has been coated with a super-hydrophobic coating; NeverWet made by Rustoleum. Drops of water on the surface move with very little friction. This was recorded at 300 frames per second to show the motion of the drops clearly.

One of the commenters makes an astute observation as a stickler for physics rules:

it’s not frictionless, it’s hidrofobic

The poster of the video had this reply:

True.  But the friction is very low.  The motion of the water drops approximates the frictionless condition very well.