What I am certain of is that there is something like (self-)indoctrination. And the sexual abuse by SSB could only take place due to this indoctrination.

There is indeed something like a strong belief persistance in spite of overwhelming evidence of being wrong. This is something very strange and one could call this mind control but it is not unique to cults.

And also that the emotional pain, and trauma of disaffection and disaffiliation is not an invention by Margaret Singer or only occurs when people get deprogrammed.

Unfortunately I have experienced and observed this all myself.