When Raymond Fowler spoke as an apologist for Landmark he certainly did not express an official opinion for the APA.
Fowler essentially spoke as an individual expressing an opinion. And he is not known as an expert or even a specialist in the study of brainwashing.
Fowler also did not cite any supporting research and has not produced a peer reviewed and published paper on this subject.
Margaret Singer did cite Landmark specifically within her book Crazy Therapies. And unlike Fowler, Singer certainly was a leading expert on the subject of brainwashing.
Also, Philip Cushman, a clinical psychologist, produced a research paper about mass marathon training like Landmark.
Based upon Landmark's persisten bad press, continuing litigation and complaints I receive constantly, Cushman's observations about mass marathon trainings seem to apply directly to Landmark.