My Dad, for years, has been shrinking in the wash. I'm 5ft 2 and am now taller than him.
It does show for some that they will never be quite there, they will look in the mirror and still be deeply unhappy, but if you don't deal with the root cause then you always will be. Total affirmation is not the answer.
Whilst the article did have be rolling my eyes a little, it is also sad that this individual (among many) will never be happy and everyone around them is letting them down.