I think the seller is confused. This looks like it is intended for cartridge bearings. I actually have a complete stronglight BB set with allow cups that came with a Galli/Stronglight/Maillard groupo.

I also used to have a roller bearing BB, though I can't remember the manufacurer. If I remember right, the bearing surface was a convex cone, rather than the concave surface of a loose-bearing spindle or the straight cylinder of a spindle that fits in a cartridge bearing.