My Oxford experience is somewhat ancient but I have been involved with universities since my Oxford days & a few things struck me about the article.
First it talked about parents contacting the tutor. I've had conversations with tutors at new universities about this - and it leaves them in a very difficult position. Students at university are adults, it's not really appropriate for them to be discussing their students with parents.
Secondly it talked about the pressure of finals. I can understand that - in ye olden days our O levels & A levels had been exactly the same - 2 years of work assessed over a few papers at the end of a course. We were used to it I always preferred that system - I found it a lot less stressful than continual assessment (which I have experienced since). I can see it might be a shock to others coming up through the system now though.
Eating disorders etc were fairly common - but as atia said that often seemed to come from within - and I believe research shows that high achieving girls are at additional risk of developing eating disorders. It's not something for the university to ignore but it probably best addresses via university counselling services, rather than individual tutors - that's true for any university.
I do think that having a certain amount of resilience helps with Oxford (& presumably Cambridge too). I had exams after two terms, then finals - that left a lot of unpressurised time helped by me not hugely hard on myself or massively ambitious - I came out with a perfectly respectable 2:1 without too much stress (found the whole thing relationship-men thing far more stressful than the work). I do think I wasted some of my time there - education is wasted on the young. Maybe things have changed, or maybe colleges differ but I has no pressure from my college at all - I wasn't even set collections unless I asked.
I do think if you go to Oxford (at least for most subjects) you do need to enjoy reading & writing. Ds2 would be a hopeless match because he loathes writing - if he ever expressed an interest I'd be horrified - even if he had suitable grades (unless he'd had a personality change in the meantime
). But ds3 who spends his life with a nose in a book & likes researching and putting together arguments? Yeah if he wanted to have a go why not - if he was up there with the grades.