Ligotti, in real life, is probably clinically insane. Not psychotic - simply not in touch with reality.
That’s a fair analysis. The interviews I’ve read with him show a guy who’s a bit strange, and insulated from the real world. It’s easy to think you’ve got it all figured out when you’re that isolated, with no one to question your assumptions.
Ever read George Macdonald? He was supposedly a considerable influence on both Lewis Carroll and C.S. Lewis.