Yep, that is the Inner Seal surface of the rear drive. This is the seal surface of the deep seal within the V11 reardrive, under the drive's right side bearing that must be removed and replaced to set that inner, right side, seal.
Pictured is what happens to that surface if badness and wetness and moisture gets in past the right side, outboard, needle cage next to the right side swingarm. FWIW, this came off the same LeMans that chuck had to use oxyacetylene to remove the rotor fasteners. Those Indiana roads!