In the realm of nouthetic counseling, "organic" means something you can see on a brain scan, bloodwork, etc. It means a
physical (rather than mental) illness for which there is concrete evidence to be seen in medical testing. It isn't referring to bipolar, treatment of depression with Prozac, etc. I suspect that schizophrenia would not be considered "organic." They acknowledge physical illness can cause psychiatric/psychological symptoms. However, they deny the validity of a wide range of diagnoses in the DSM, if not every one of them. Some siee some limited validity of certain medicines. Some don't. I suspect that one reason why the organization has a policy against straight out telling people not to take their medicine is that they don't want to be accused of practicing medicine without a license and because they don't want the liability.
I'm less familiar with Lambert than I am with various Presbyterians, or people I've assumed are Presbyterian due to an association with WTS. But I do know that Lambert is
alleged to have instigated the firing of a psychologist from Southern due to his anti-psychology stance. Some of Lambert's critics might say that the article is not free of disingenuousness or sleight of hand. See also the statement at the end: "People who have spiritual problems will not change as long as they keep taking drugs as a cure. They will only change as they draw near to Jesus in repentant faith." What happens when the counselee tells the doctor they don't need or want the antidepressant or antipsychotic anymore and the doctor disagrees? I'm sure it won't surprise you that many doctors in a wide variety of specialties deny the validity of spiritual problems altogether. Lambert's latest is attacking the validity of things like "trauma-informed."
I don't have time to get into a long and drawn out back and forth on this. MacArthur is not known for nuance or representing opposing views charitably. But saying mental illness doesn't exist or whatever isn't something that he came up with on his own. It isn't something that came out of IFB World (which he's never really been a part of) or pentecostalism. His views on that come straight out of Jay Adams' work, a reformed minister and seminary prof.