An author of the 1973 American Psychiatric Association standard says it was never meant to stop doctors from expressing their opinions based on public information.
Edit: changed the title from the site to say "Doctor That ..." instead of "Doctor Who ..."
While that is a confusion-clearing thing to do, my understanding is "who" is used in reference to people, and "that" refers to things. So, grammatically incorrect but semantically correct.
In this case, I think adding an article would also have cleared the garden path— that is, "The Doctor Who [...]" — but yeah, the meaning is clear enough this way.