New Demo photos gave me the impression there's a link running below the BB, so here's another guess at what that could look like. The shock linkage is essentially the same as the old (V4) Supreme DH and the Actofive P-Train, with a very similar LR curve to the current Demo and Enduro (linearly/straight progressive), which might make it more plausible.

And here's a bonus approximation of that Forbidden: