I asked Mr. Finley and according to the PGA the balls have to be uniquely named and since they still had the OG Chrome soft in play they had to add the dots. I asked why not just one dot, and he said they used the single dot on a proto that Phil played when the chrome soft came out, so it was already taken. Nothing special about the two dots, just naming to differentiate it.
cool info! Thanks, Neb!