It's not, it's a term that your parent made up three weeks ago and brought it up now to drive traffic to their medium page. And, I hate to use the term "nobody", but, it's not like this is a credentialed doctor or even educated medical commentator...just some rando with <100 followers.
It's the only use of this term that I've seen in this context.
That said, I get the use of the term and the ableism behind the term NPD...it's actually a pretty good article.
It is a dirty rotten SEO trick though. So their name on Medium is also Grail, but with "Viridian" before it. And an "@", per Medium's methods.