Hey, knitters!

Input needed!

I'm trying this cast-on for a thing that needs to be very stretchy. But the stitches I made with this cast-on do not slip at all. It's like I have a series of knotted loops. However, when I unravelled the cast-on edge, they pulled through like regular knit stitches.

Could someone else try the method shown in this video (!) and tell me if they also end up with non-slipping stitches? Because if these stitches are supposed to slip like normal stitches, I'm clearly doing something wrong.