I was also considering the significance of his adverse childhood experiences in light of his self-described social ineptness and phobic tendencies. It leads to the consideration of alternate possibilities:

* "NA-/= phenocopy in a genetic NA type" as you've alluded to

* the genetic A- trait, which entails an underlying propensity to social anxiety, the intense manifestation of which being educed by his early life circumstances, bearing in mind that plenty of NA- types don't manifest social phobia to the extent which he did, and which he might not have if the circumstances of his upbringing (ostracisation/bullying by childhood peers, abusive alcoholic father, cancer death of his mother as a teenager) had been otherwise.

Meat Loaf upbringing