psilocybin (or more accurately the active drug it is converted to, psilocin) and LSD are extremely similar as classical psychedelics. psychosis is possible with any sort of psychoactive drug and individuals with a family history of bipolar disease or schizophrenia should avoid consuming any psychoactive substances. with that said, psychosis is extremely uncommon with LSD in healthy individuals at reasonable doses, and LSD use actually has a slight negative correlation with later development of schizophrenia.

i'm not sure about that particular case, but consuming LSD while on lithium (commonly prescribed for bipolar disorder) essentially guarantees an acute episode of psychosis and possibly seizures so I wonder if that particular individual was on lithium at the time.