It's definitely thin. Also, I was freaked out the first time I saw that discoloration, Tools R Us had to calm me down.That second photo is what I expected to see. That is consistent with an induction hardening process. They stick a plug into the bore and heat the forging. The bearing surfaces are then hard cut to match the ball profile.
Looking at the end-on photo, I can see that the material is thin enough to have burned through to the OD. Good info to have.
Even worse, this is about the 700th thread about it.