He hasn't successfully made 57 KG in years, since he won his Worlds title. Even at the tournaments he has entered overseas they were either with a +2 KG (which is ~4.5lbs) or at 61 KG (which he has had zero - yes zero - success).
I don't think he is done, I just understand where they are coming from. My opinion on the matter is based off his past, whereas other's opinions are based off his body of work since his title. Both sides have merit, but only one gets weaker as more time passes (mine).