Yes, but see my post about siblings having different experiences.
Maybe Harry can't understand why William isn't grieving/hasn't had the same reaction to trauma as Harry himself has.
Things are different for each of them - birth order (massively relevant for the RF actually), how their parents relationship was at the time of each birth, pressure or mood of the country at the time of each birth/the influences that placed on their parents during each child's early years.
It's not about infantalising. They are very different people. Also, who's to say William's trauma might not be more infantalising? (keeping a tight lip/towing the line. Denying?! Who knows!)
Some might say (Americans who have had a lot of therapy 'journeys'?!) that Harry's process - making a fuss, talking, literally moving away, the whole primal scream of it all - is actually more mature and healthy - for him.
I mean, I'm not of that opinion, but maybe it is savvy to try and make money out of it. Not dignified like Will, rather Harry is being canny.....
Dunno, like @upinaballoon am musing and look forward to returning to this chat with more of my cod-psychology shit later! 😜