They have created their own definition of the word lie. According to them it must be deliberate. If ex JWs do state something that is incorrect, it is often just a mistake.
From the same Warchtower they also say this
We must be determined to build and maintain strong relationships with our brothers and sisters now. Why? Because our enemies will try to divide us by means of lies and misinformation. They will try to turn us against one another. But their efforts will be wasted. They will be unable to break our bonds of love. Nothing they do will disrupt the friendships we have formed.
This is just hate speech and paranoia. Who are these so called enemies that are turning them against each other?