If you look at it, it looks like it can be swapped right in for a rear torsion beam... any one ever seen one of these in person?
It will hit most of the fuel tanks. Hits the Mk 2-3 for sure.
It has very little advantage. This IRS setup has the same geometry as the twist beam.
I think that will add weight and complexity with no measurable performance gain on the race track. But at least it would cost a lot...