Just because it's more often contested doesn't exempt the author from the responsibility to grapple with (or at the very least make himself aware of) the reasons why it's included in the DSM and the ISD and why it's been acknowledged (if grudgingly) since the very beginnings of the discipline and before - including a long section in James "Principles of Psychology" - if he's going to make such a claim. He seems patently unaware of the long list of psychological principles that no one contests that align with the diagnosis - from the existence of discrete states in sleep and infancy, to brain microstates, to state-dependent learning, to extreme state switching in bipolar, periodic catonia and the other disassociative disorders, to the commonality of hypocrisy of which the individuals themselves are blithely unaware, and the trickiness of personality science.

And that's not even addressing the highly detailed and often highly public case studies of DID across time and cultures, the research showing dramatically different brain readings across the spectrum based on the current identity of the DID patient, ect, ect.

But he doesn't even attempt to address any of that because he has no idea what the hell he's taking about. It's a deflationary article with the populist message that psychologists and Tiktokers are the dumb. So I get why it's popular, but it adds all of nothing to the conversation. He's just another panderer milking the public for attention and money.

And as for the label, again one can acknowledge the existence of a biopsychosocial cluster without coming down on either side of the question of whether or not they are symptoms of an underlying disease. There's a long history of scholars doing this, particularly in the sociology of mental health. Additionally the author does not appear to be making any such argument here against the psychiatric nosology as a whole - just this one diagnosis.

Edit: grammar.