This is a BS article that's basically a clinician's pet peeves and grievances. I know three close people with a BPD diagnosis. They had both a similar constellation of personality traits and all three were first medicated with antidepressants to no avail (a common trait in BPD is that it is easy to confuse for major depression). They took BPD-specific drugs and after a few trials and errors their quality of life incr…
I've known two women who were diagnosed with BPD that later turned out to be Autism. Their doctors believe BPD traits developed due to the issues their autism had on their socialisation as kids and teens. Getting on Ritalin massively improved their and their families lives. At least in women I suspect more than a few BDP diagnosis mask autism.
We don't have affirmative biomedical tests for these conditions. Until we do, they are just constellations - funny imagined shapes - that we're drawing in a galaxy of traits on display in that person's life. Your picture of a "tree" overlaps about 30% with my picture of a "mushroom". But it's not the case that "First it was identified as a tree but later turned out to be a mushroom".
We pretend that these things are distinct biomedical disorders because it makes it easier to talk about them, easier not to literally murder the person displaying them, and (bizarrely) because it's legally required to classify them in order to bill a therapist/psychiatrist for their treatment, but in reality they're parts of a maladaptive personality that just look very roughly similar to other maladaptive personalities we've seen in the past.