Of course KP made a huge error, they created a cryptic information vacuum, fuelled it with fake images etc and then berated the public for wondering/worrying about what was going on.
I really don’t think this is true. They released a very clear and informative initial statement saying Kate had had major abdominal surgery and, following current medical advice, would not be resuming duties til after Easter. For the vast majority of people that was enough; it wasn’t remotely cryptic. They issued a further statement when she was released from hospital and began recuperating at home: so not an “information vacuum” unless you wanted a livestream bedcam.
”Fuelled it with fake images”: one. One image. The Mother’s Day pic. Not Kate in the car with her mother, not Kate in the car with William, not the farm shop video. One photo that Kate has taken responsibility for editing: if she didn’t tell staff how heavily it was edited, how would they know not to release it? Ten days after that pic, they filmed her statement; 12 days after, the statement was released. Not a lot of time, really.
I have no idea about berating the public? I don’t recall KP doing so. Wouldn’t blame them though.
The only “misstep” – and I really don’t think it was – was William dropping out of the service for personal reasons. Given what we know, they’d clearly just got the information about cancer, and rightly he prioritised his family in that moment. They said personal reasons because it was; anything else would now be shown for a lie, so they thought ahead. And they couldn’t tell the world it was cancer right there and then because they’d not had five minutes to digest it.
The Mother’s Day picture was an unforced error, but the rest is on the media, social media (including failure to control bots and disinformation campaigns), and the public.