That Poitiers movie was a useful experiment as it was done with an earlier version of the mount (no pics I can find) where the rubber supports were much closer together - about the width of the camcorder itself. This enabled a lot of rotational movement, which is very visible.
The Mk2 mount (see earlier link to the pics of it) has the rubber supports further out, on the plywood sticks, and this much reduces the camera rotation. I need to do another movie...
I then realised why the expensive professional antivibration mounts mount the camera in a rigid frame, which is supported by some rubber mounts
at the bottom and by some more
at the top, inside another rigid frame, which you then fix as you wish. That symmetrical support ensures that any sideways movement (quite common in turbulence) does not result in a rotation of the camera. Pure straight-line sideways or up/down movement of the camera is invisible if the visual field contains distant objects only. Some of the pricey mounts get quite clever, like
this.