I think you misunderstood my point. To make it more clear:
1. I'm convinced it was a major, perhaps fatal strategic error by the defense to have put that psych expert on the stand.
2. He was essentially tasked with convincing the jury that Skylar made a false confession, and why she would have done so.
3. IMO he was prevented from presenting ANY diagnosis he made in full context, because to do so would necessitate providing ammunition to the State: that Skylar's pathological submission to authority stemmed from her enmeshed relationship with Kim, which would make it more likely she would have done anything to stay Kim's wrath, including killing her baby.
4. Absent the presentation of any other context, yes, I think the diagnosis he presented will seem very vague to the jury, and worse case, as an absurd rationale for how she responded in the second interrogation.
That isn't a dismissal or minimalization of the disorder itself, much less of mental illness as a whole.