Story is he was fined 1000K for wearing non conforming shoes, in other words, he has to look pretty much like the rest of the team in uniform.
That would mean at least half the color of the other players shoes, so he markered in one half of each shoe black. He should have known better and also his managers. These guys just try to push the envelope a bit more than most.
I think that the Marlin's manager was just making a point, but maybe didn't come off saying it the right way.