The doctors I spoke to have very strong criticism to the auto-immune theory, and are very frustrated that the new research is going to commit time towards this theory that Waldinger unfortunately hypothesized without proof. They believe time is much more well spent testing neurological changes that lead to the many brain symptoms in POIS. Since these are the symptoms harder to treat with POISers.
This is not a criticism of the new investigation though, it's an expression of frustration that I totally understand. Regardless in their belief that POIS is mostly a neurological disease.