Yes, Diana herself spoke (I think on the Bashir*spit* interview) about how she used to lock herself in her bedroom during crying jags and william would sit on the floor outside her door pushing folded tissues under the door for her. That's the kind of story hazza would kill for, but Wills trumps him yet again
with a story from mummy's own lips. "IT'S NOT FAIR!"
Also in the interview that the bros did jointly hazza bemoaned the fact that in her last phone call to the boys he refused to come to the phone because he was outside playing (soldiers I think he said) so it was William who had the last conversation with mummy. I think hazza has twisted these things into William stealing mummy's attention from him even to her final moments.
Which segues nicely into the oprah(spit) /mental health thing ... I think oprah thought she had a gold mine of info on diana and the boys' youth, but upon delving deeper there is nothing there but hazza being a spoiled brat protected by big bro William and the rest of the family since birth. He wasn't mistreated or neglected as he'd have us believe, quite the opposite. She's no fool and likely realised this was not the story she'd hoped to build a mental health program around. Apart from anything else,(dons therapist hat) I personally totally believe that hazza has some issue/ism that affects his ability to absorb facts and details.Hence being held back at prep school, the Eton cheatin' incident and his inability to pass the full exams for helicopter piloting where he had to settle for co-pilot position. Not to mention very recent events since megxit. She won't want the responsibility of going down that rabbit hole. Much as I despise her she's a smart cookie.
Also, when this was first floated as an idea Covid was just a blip, but since then it has rampaged through our lives and we are all suffering mentally. Nobody gives a shiny shit about millionaires in their mansions wailing that daddy had a mistress and it hurt. Boo fucking hoo. People are struggling for real and cracking under genuine pressure ... no sympathy to waste on fools like oprah and hazza.
I'm sure a program will come eventually but hazza will not be the main focus. He won't like that.