Tube: I checked this with R21, and I can confirm it. If I use it in R20, it works as in the tutorial.
Thank you for bringing this to our attention; it should be noted in the tutorial. This is based on the change of the Tube Object in R21.
The Border setting with the Tube can be achieved with the Phong Break 89º, in case this is what you need right now.
I will move this question to the Cineversity Toolbox Support, so the tutorial text might mention this in the future.
Sorry about the trouble.
My best wishes