Of course it does – one cannot spell/say true without writing/saying rue.
(true -> rue)->(not rue -> not true): in words, if true, then rue; if not rue, then not true. This is an example of the famous logical tautology: if x, then y; then if not y, then not x.
If any statement someone made about us or our behavior does not give us rue, it probably was not (entirely) true.
Namians could not spell “true” in their beautiful and happy language with an embedded rue. Namians can tell the truth about themselves and us without causing themselves rue, but probably not without causing us considerable rue. So diplomatic and polished are they by nature, they would manage to hint the truth about us to us. But even a hint of the truth about ourselves is painful, so false are we to the core.