Are you in the UK?
When you get an autism diagnosis, you're not given a profile along with it, although some psychiatrists will align certain behaviours with certain profiles, ie. sensory seeking, sensory avoiding, PDA, but typically in the UK it isn't an actual diagnosis. It's just useful for recognising why some behaviours manifest.
Also you say psychologist, not psychiatrist? As far as I'm aware psychologists aren't permitted to give diagnoses, if they suspect a diagnosis might fit, their role is to signpost you to available services for diagnosis.
My own sons psychiatrists official diagnosis for my son was autism spectrum disorder with a significant speech delay, but she only verbally recognised that his behaviours may align with pathological demand avoidance, or as it is also know a pervasive drive for autonomy.
If your psychologist is just a run of the mill counsellor/therapist then I would be sacking them off for overstepping their medical boundaries, though if you felt there was a merit to what they were saying, follow the proper diagnostic pathways.
PDA is an explanation, where certain behaviours where the fight, flight, freeze and fawn responses are a direct result of a perceived threat to autonomy, whether that threat is real or just perceived, and as a result there is significant neurological distress. It's an explanation that the behaviours exhibited are not a choice they are a survival mechanism.