Nowhere in that link does it say you can transfer to PS4 then rebuy PS3. It says that to play on both versions you must buy the PS4 version. That makes sense because the PS3 version is really cheap like $9.99 or less because its been out for awhile. Their account system could be set up to only let you enter one PS3 key and if you transferred it to PS4 then you can't enter another. Personally I don't know a rep would know better.