My apologies for using the word rating. I realise there is no aerobatic rating, even for instruction of aerobatics, but a restriction which needs to be removed. Clearly, this cannot be removed until the basic instructor restriction is removed, so for now I'll just have to carry on doing aeros on my own time and money.
It's much like people saying renew, when they mean revalidate. So many different terms and interpretations of them.