[MichaelGG]

No, that's not what the article says. It says they can carefully screen for "people with active psychotic disorders or a strong predisposition for such disorders should not receive these treatments".

Take note of active and strong predisposition. They're saying if someone is obviously having problems, or seems like they might (e.g. many family members have had issues), they can find those folks out.

It is not in any way suggesting they can detect psychotic dispositions in general.