Terry, the mastermind apologists that know they haven't a leg to stand on say "indeed, the truth doesn't change, it is our understanding of it."
This would be like a Doctor prescribing a drug that turns out to cause cancer and saying, "It wasn't my prescription that gave you cancer it was the medicine." Once you have cancer you live with the consequences.
What does the Watchtower Society hold its members accountable for if not its current understanding of Truth?
It is all the flock has to go by. Plus, they are not allowed to find fault with the reasoning behind it--especially when the teaching turns out to be fallacious.
Jehovah's Witnesses do not live by TRUTH. They merely follow the whims, conjecture, amateur chronologies, crackpot interpretations of the Watchtower leaders REGARDLESS of the accuracy or harm.
The Governing Body says "Frog" and the Kingdom Halls jump.
The so-called false religious denominations were teaching things all along which JW's denied. Later, the JW's were taught a change to the previously held FALSE teachings which Christendom had correct all along. Romans 13:1, for example. Jesus having a beard for another example.
But, it's not about what's True.
It's about pretending its True and just doing what your told no matter what.
The Governing Body must believe that it--itself IS the Holy Spirit. Why? Because to sin against IT is unforgiveable.