Reading this brings to mind very similar stories about people trying marijuana and suddenly undergoing long psychotic episodes and/or becoming diagnosed with psychotic conditions like schizophrenia or bipolar.

The vast majority of these cases always end up being result of a genetic predisposition to psychosis.

That seems exceedingly likely to be the case with those who undergo psychotic episodes due to meditation.

I think highly introspective and mind-alerting experiences and substances like meditation, cannabis, and psychedelics all have the unfortunate side effect of potentially causing latent mental illness to surface. But it only happens when there is a latent mental illness.

Better advice might be to warn people about meditation if their family has a history of mental illness or if a doctor thinks they have an increased risk of mental illness. It should not pose any risks for an average person.