Currently, the course is a distinctive specialty.
The lengthy 4 month process thru which the original instructor outline was developed and the rigorous review and modifications required by the PADI technical diving course evaluator, would leave me to think that any qualified instructor could get it approved from themselves.
I see it eventually going the way of the full face mask, solo diver, and other courses which started out as a distinctive specialty and then progressing after a number of years to a normal recreational specialty. All of the distinctive specialties that I used to have are now regular courses.