Yes i think this is another one of the JW's control tools. To be labelled as an 'Apostate' in some ways is worse that being disfellowshipped/dissasociated. Its an effective means of 'Tarring & feathering' you if you become what they consider a threat to the Organisation. I must admit i had never even heard of the word 'Apostate' before i joined the JW Org and very rarely hear it being mentioned elsewhere and i think this might be true in a lot of peoples cases. Because of this i think the JW Org sort of adopts this word and adds its own flavour to it to give it its own special potency to which it can then use for its own manipulative purposes.
LFCV