That’s not what they said, you’re presenting a false dichotomy. The truth is, in determining what another person feels, if you refuse to trust their words, then you can trust nothing. Yes, there are signals that hint at things that might lay below, but you cannot tell someone what their inner thoughts are better than they themselves.

In that vein, something often said of those who have killed themselves is “but I saw them yesterday and they looked so happy!” By your logic, if they looked happy they must have been happy, and just felt like ending it one day for no real reason.