I can't speak for the above person, but what the OP of this comment thread said also tracks with my own experience of schizoaffective disorder: when I'm psychotic, the pattern matching part of my brain goes into overdrive and not only does my brain erroneously fill in the blanks in sensory input (causing hallucinations), it does the same thing on an abstract or logical level with ideas and people. It's easy to fall into the trap of paranoid delusion when you feel like you're seeing connections between so many otherwise benign, disconnected things and events.
I think what really gets me is that despite my constant vigilance and skepticism toward my own thoughts, I simply cannot talk myself out of how truly real those delusions feel when they happen. I can even acknowledge how absurd they are, even in the moment, but I can never shake the feeling that they're still very, very real. It's so maddening. The best I can do is to just not act on those thoughts.
Maybe the above person's family is actually unearthing valid insights, but if they're prone to psychosis, in that state they'll be prone to finding connections, associations, patterns, and so on between things in a way that doesn't hold up to scrutiny. It'll feel very real to them in the moment, but when they exit that state (if they do) they'll likely be on the same page as others in thinking those ideas were a stretch.