Robert Henry wrote:

Inside Class D, below MVA, for a visual approach in vmc? Aren't both
aircraft VFR for the purposes of collision avoidance at this point? What
protection would be provided? Radar services are not being provided to
either aircraft along the ODP since both are inside the ring and below MVA.
Now if it were IMC, that would be a different case, but there are no
approaches that traverse this ODP, so there would be no truly VFR aircraft
or IFR aircraft on visual approaches in that space; it's pretty easy to
protect.

IFR aircraft are always provided separation from each other until
touchdown, the type of airspace does not matter. The fact that one
aircraft is inside some kind of ring or below the MVA is not relavant.