I think it is true, just coming to the realization that we were duped by a cult can make you look a little bonkers for a bit.
Some radical thoughts, saying things to current JWs that make you look a little bit, well, crazy from our point of view is very understandable, from theirs we look a bit crazy just like the WTBTS says we will.
When talking to some Elders who wound up at my door a few months ago I was supposed to say " I'm depressed, blah blah blah," Had it planned out and all and then when they said certain things I was not able to hold back and while maintaining my composure I did kinda let them know that I did not agree with them.
I'm sure to THEM I looked and acted a little bit weird saying the things that I said.
So yes, I think that going a bit nuts is almost mandatory to get it all out.
NJY