I explicitly presented it as a theory of PDA, not a fact.
The publication itself is in references:
Milton, D. (2013) Natures answer to over-conformity: a deconstruction of Pathological Demand Avoidance (PDA). In D. Milton (2017) A Mismatch of Salience: Explorations in autism, from theory to practice. Hove: Pavilion Press.
PDA is not an 'accepted diagnosis'. It is contested because there is an overlap with non autistic types. The presentation indeed reflects this discussion.
To the point of listening and having a dialogue, this theory could suggest a happier family life for both AS and NT could be found in accepting each-other for who we are and listening and recognising communication signals and needs in the way they are authentically expressed, i.e. for autistic people in autistic language. Understanding each-others language and needs, not micromanaging and imposing NT expectations.
PDA is not recognised as a disorder and one theory - the latest, is that it is avoidance and resistance to demands being put on the autistic person when these demands are totally externally motivated and have no internal value, are too removed from internal needs, priorities, and functioning. For example when they are forced to behave in a NT way when there is no internal value and demand for that. This could potentially trigger PDA and exacerbate things.
A theory, published.