They would have to be very dim indeed not to have known. They did it intentionally. Any claim that it wasn't done on purpose, and left uncorrected on purpose, is just fatuous.
That doesn't mean I don't have sympathy for his struggles. I do. Anyone would who has watched him try to cope with his mum's death and the awful aftermath, and also growing up under all the media scrutiny and the poison that brings.
Then he seemed to finally have found his purpose in the army and with charities/Invictus/partnership with W&K/etc and I was glad it all seemed to be falling into place as he got older. I was very happy for him when he and Meghan found each other and when they got married I thought it was fantastic that the sun shone so brightly for them - it seemed such a good omen and I hoped it would be the start of a very long and happy life for them as working royals.
It also doesn't mean I don't have sympathy for her struggles! The media are poison.
I continue to wish them well, but it's clear he needs to sort his head out. I don't think the drugs were/are good for him.
I think many people have/had a soft spot for Harry. But he needs to sort himself out. He's got to take responsibility for himself and stop it with the petty gripes - and I don't mean that all his gripes are petty, I hasten to add. But many of them are quite ridiculous and he does need to let them go if he wants any hope of getting over it. Fair enough, maybe he has to get it out of his system. In some ways I don't blame him! But...bitterness never heals.
(I've written more on this than I ever thought I would, in the past few days, tbh! Won't bore you anymore with the tedium.)