The full title (for me at least) reads "As a psychiatrist, I diagnose mental illness. Also, I help spot demonic possession."

The HN title reads "As a psychiatrist, I diagnose mental illness. And sometimes, demonic possession." This suggests (via linguistic ellipsis) that the psychiatrist diagnoses demonic possession. However, he explicitly does not.

> I technically do not make my own “diagnosis” of possession but inform the clergy that the symptoms in question have no conceivable medical cause.

This is an interesting distinction. Of course it would be ridiculous, backwards, and unscientific for a medical professional to 'diagnose' someone with demonic possession. But to admit that the symptoms are outside the scope of modern psychiatry seems a more reasonable reaction.