It describes the real life experience of every fat person I know to a tie. Including myself. Anecdotal I know, but I also know I'm not alone.
If you have any doubts about my weight loss experiences; I can tell you that after age 21 I have had every weight on the scale between 72kg and 140 kg. Losing 30% of my body weight over the run of a year? Done that. Increasing my body weight by 50% in the same time span? Been there. Learning about internal and external motivation? Yep. I can probably devise effective and delicious diets making you lose 10kg over 10 weeks.
I understand that feeling of satisfaction over your recent successes, I advise you you however not to slam the real life experience of other people just because you are pulling your belt a notch tighter for as long as it lasts.
It makes you sound like a smoker friend of mine who says that quitting smoking is easy; he's done it lots of times.