This story made several other outlets too.
I believe some airlines are seeking to address it more assertively by requiring the obese to purchase 2 seats.
That's been the case for many years. One of our acquaintances has significant medical issues and even in the 1990s had to purchase two seats to fly. Some very difficult cases and no easy answers / solutions here.
Reading on the Snowdon story further, I note that it was a case of "this happens more and more" and not "sorry - never happened before" so it is - by their admission - not a one-off. And I do feel sorry for the chap who booked ahead, arrived and collected his ticket ahead of time, and was then denied travel through no fault of his own ... of course, as the media were on his story, we may not have seen the other side fully.
The terms and conditions - regular though they may be - are utterly lopsided. It's not OK for a customer to cancel, but it's fine for the provider to cancel / deny provision. And are they excluding the repayment of the booking fee even if they cancel .. not to mention the costs of the person to get there and his wasted time.
I've every sympathy with those who suffer these problems as a result of a medical condition, less so for those in the majority for whom it's a lifestyle choice, although of course we live in the age of entitlement where people are extremely reluctant to take responsibility for themselves...........the conditions you quote do seem a little lopsided (notwithstanding the fact that they have little control over the weather), however in the specific circumstance of a heftier population, I guess it's something that they need to build into their contingencies and procedures....................although as we see only too frequently with
GWR▸ and elsewhere, contingency planning is not something the railways are particularly good at.
I vividly remember visiting Vegas back in 2001, this being America they were already well used to catering for the fuller figures and actually had an area in the restaurant with specially strengthened furniture - I kid you not!
As they say, when America sneezes, sooner or later we catch a cold!