The dude's request was clear: Be honest. Tell me what your organisation does, whether it's an organisation that lies and keeps secrets. Can I trust your organisation?
The elder's tactic was just as clear: First, study the Bible (in reality, a WTS book) with us, and later maybe we'll let you know more about our organisation. For now, I'd rather you just shut up and listen. And if you're not going to shut up and listen, I'll just go.
Studying with the JWs is like signing a sales or insurance contract: sign on the dotted line and maybe later you'll find out what's in the small print. When I signed on the line in 1986 there was no fine print to read. They controlled the information. Now, thank God, we have the internet and books by Ray Franz and others.
The cheek of that elder to throw it all back on the dude, claim that he was being deceptive, was disgusting.