I wouldn't be so hard on people who still use the term, "the truth", especially people who were born into this religion. It is very ingrained. And to them, "the truth" means the JW religion, not necessarily the TRUTH.
I was talking with a friend recently, she's DF'd, knows more than me about all the lies and subterfuge, yet when we talk, she'll still say things like, "Remember Brother so-and-so..? He left the truth, too." She was raised in the religion, and knows absolutely that is not in any way, shape, or form, "the truth", but to her, it is simply another way of referring to this religion/cult.
She gets impatient with me when I mention her use of this expression. "Well, of course I know that it isn't "the truth - it's just another term for that f'd up religion!"
So while that term grates on my nerves, too, I understand it takes a long time, if ever, to eradicate.