Because the intermediate bond can be described with classical mechanics, there might be a quantum description for the 3 particles (electron+2d).
Classically, an accelerating electron radiates energy away. I wonder how he proposes that the electron would avoid acceleration in the bond. In quantum mechanics, stable bonds correspond to acceleration-free standing electron waves (wavefunctions).
As far as I know, the problem of axially symmetric molecular H2+ orbit is analytically solved in QM. This analytic solution in principle should show what inter-nuclear distances are possible.