The WTS can't even be original in defining their own theology. "Present Truth" is used by many religions who believe that they too have God's power of revelation.
It is all so much horsehit.
As for apostacy, the answer they give in the Insight Book is a far cry from the the definition they give us in the flock book. An adherent must beleive everything that the WTS teaches, in their words, "beleifs that are particular to jehovah's witnesses." If you don't believe it, you're apostate. Funny thing, most witnesses DO NOT believe everything the WTS teaches and many have no clue what they teach at any given time about a particular subject.