I agree with those that have already posted about cult techniques. The control of information is a way of controlling members. You are right, they will say one thing in a talk and something different in a WT study article, and something completely different on jw.org.
The information elders get is secret and different to what JWs get.
This can cause a lot of cognitive dissonance when you first realise it's going on. But when you understand it's a cult and it is what cults do you can move forward. Steve Hassan talks about this and can help you through it. I suggest you read Combatting cult mind Control. It's a good read and helps tp free up your mind.
Kate xx