You do have a point but Bhutan does not need to excel in all of these factors. For example, Singapore is ranked fairly high on this list but does quite poorly in the Importation of Weapons. Same as Bhutan. It does well in security and peace (which are one of the factors countries need to have to be on this list) but it does not that good in life expectancy.
Singapore is actually relatively high in the world for arms imports worldwide according to https://www.jetpunk.com/user-quizzes/38391/top-arms-importing-countries .