@Iwasafool, it's a well-known piece from 2013, generated a lot of discussion in the media when it came out (the Daily Heil had some clickbait headline like PLASTIC PRINCESS DESIGNED TO BREED!!!), and it was discussed in detail on here on more than one occasion. I can't help it if you've never heard of it, and didn't read the extracts I posted properly.
In fact, you don't need any further context for those passages, anyway.
And it's pretty disingenuous to pretend you're unaware of the long history of media discussion of PK as 'painfully thin' -- it comes up on here all the time. Those aren't HM's personal opinions, they're her distillation of the public discourse around PK's body. Which was, in 2013, mostly concerned with her thinness and pregnancy/ies, whereas ten years on, 'Has she had cosmetic surgery?' and 'How is she ageing?' has been added.
The essay is remarkably sympathetic to PK, and to the Queen and Diana, and I think was fascinated with Prince Charles suits. She'd certainly met both PC and the Queen.