I never bought that idea of Kirk's ship being the only one to return. It just doesn't sound credible.
Maybe that's why it's always the "only" ship in the area, the other's are all ceased to be. I never thought that was credible, either.
As to the OP, Uhura reported that the Starfleet leadership forgave Spock for his transgression and he wasn't to be executed. So, it was probably not widely reported, as the only officer to break the only regulation with the death penalty didn't get any penalty, it's hard to enforce laws after that.