I think J Edwards means that none of these types of studies are interpretable because they are open-label and use self-report measures, so they can't provide reliable evidence.
We don't know the severity of problems that patients were experiencing other. They may not have been sufficiently intense or dangerous to warrant the study stopping. I would be suprised, if the information from Enlander is correct, if this were not under regular review.
Stopping a study midway because the outcomes were very undesirable would be almost as good as having a study that showed GET did not work from the point of view of challenging the PACE trial.