Below are depicted three separate "building blocks" of ultra-dense hydrogen in various different spin states (s=1, 2, 3) that I tried to reproduce in a 3d program with correct relative orbit sizes and motion. Other features are drawn exaggerated for the sake of clarity. Note that in reality UDH atoms aren't supposed to be stable on their own.
can : I'm working on it. But it's new ground. 4D matter looks quite different and the energies do certainly not correspond to a guessed 3D Bohr or QM like approximation.
Thus what Holmlid measures and the conclusions thereof are two different things. As Julian mentioned: The explanation includes the reason for the Zitterbewegung, which is by far not obvious. I hope I can soon tell much more.