I believe there is a lot of good that can come of understanding one's self more fully. It's the heart of repentance, and much of what we do to help people understand themselves is no more than helping people see and understand and address the core aspects of their inherited tendencies and finding coping and/or change mechanisms. I believe in that type of effort deeply, so I applaud any work to acquire this type of "internal understanding".
However, I cringe mightily when physical and emotional disabilities appear to be credited to evil spirits. I have no problem with the overall doctrine of evil spirits, but I also believe strongly that much of our terminology in this arena is symbolic - and I am wary of people who present things in ways that can confuse the issue and frame everything in black-and-white, mortals v. spirits terms.
Also, the framing of the idea that children can be subjected to evil spirits because of their ancestors sounds like just another way to say that they inherited certain characteristics and tendencies as a result of the Fall. I would rather phrase it the way the Church currently phrases it (inherited characteristics from the Fall) than do so the way it was phrased 2000 years ago (evil spirits) - even if I accept that the way it was phrased 2000 years ago was the proper way to phrase it then.