lowfat, no, but then neither have you. If only certainties were posted on this rumour forum, it would be a dull and postless place.
I am however aware that minor imperfections are easily visible in a mirror smooth surface, that the shaft has a relatively wide internal bore and is relative short (from the end to the area in question), and that a photo making the corrosion plainly visible is already in the public domain. Therefore I conclude that it is quite feasible to check other shafts in the same way, and to not do so would seem foolish. If you can't see all that, it is you who is posting from a position of ignorance.