"I have been treated for ADHD and as a result I understand some of the ways that a lot of psychiatric institutions fail patients with disorders such as ADHD, autism and others."
The article (despite the clickbait-y title) isn't really about the existence of DID.
Then it shouldn't have been couched in those terms for the first few paragraphs, and especially not by blithely staking such a claim.
Imagine being told your problems aren't real as a prelude to making a point. Just for clicks. Screw this guy.