Because Twitter is all about broadcasting to people who follow you, I've always understood the "only those you approve" part to mean "those people following you

Because Twitter is all about broadcasting to people who follow you, I've always understood the "only those you approve" part to mean "those people following you that you haven't blocked". The idea that you can get around being blocked by temporarily deactivating your account is interesting though and feels like it could be easily abused in this way.