Paint buffers only work if there are parking spaces on the other side of said buffer. We very rarely get cars parking in the cycle lane here since the loading spaces prevent that. There's also a hashed area to prevent cyclists from being in the door zone.
It didn't look like vehicles - especially but not only delivery trucks - were always careful to avoid parking over the paint buffer in the video posted. Maybe it's the culture, maybe it takes time for drivers to get used to, or maybe there are differences in the cases themselves, but paint buffers with parking in the other side doesn't seem to be a working solution on this side of the pond...
True, see my other comment about kerb separation in this thread. That's always better psychologically but both seem to work well in Manchester when implemented right.
You don't happen to have more info on the material they are using for those small curbs, do you? I've seen similar ones in both concrete (like you'd find in parking lots) and plastics that are cheap (and moveable, good for pilot programs). Or is it just a regular curb?