Attachment disorder <> Complex PTSD <> BPD; nor are subsets of one another.

Despite having various commonalities among them, they are all very separate constructs, and I do personally think that the aforementioned article is leaning towards some unfortunate oversimplification by suggesting that Complex PTSD simply be treated as BPD. It's not necessary to collapse concepts in order to share some treatment possibilities. I suppose I also see the effort to do so as a marriage of convenience amid proponents in the psych industry, since they are all areas in which there is still a struggle to provide consistently useful treatment.

I personally see many ways in which they are different -- even besides the very basic reasons of one being a development disorder, one being a stress disorder, and one being a personality disorder.

I myself don't have the symptoms of Attachment Disorder or of BPD. Perhaps miraculously in both cases considering my upbringing of intense neglect in an environment of Cluster B disordered individuals (both NPD and BPD). Maybe the exact configuration of the exposure gave me some odd type of immunity to the personality and relationship related effects.