The problem with this statement right out of the gate is that when a mormon or a defender accuses a dissenter of mormonISM of lying and challenged on it, there is usually no reply or response...a couple of posters come to mind. In effect, they've lied in order to accuse someone else of lying...
In addition, lies of ommission are just as bad as an outright falsehood...would you agree?
It does get weird around here. Unfortunately there are those on both sides that aren’t completely accurate in their statements. I do, however, excuse most of them as ignorance. Thankfully it appears that there are very few that maliciously do this.
I was working on a longer answer, but decided against it. Not really any value to bringing up old issues.