your league is called the National Basketball Association, not the World basketball association.
in football the champions league is the most important club level tournament in the world, whoever wins it is the best team in the world, but that does not make them “world champions”, since it is not a world tournament.
when they win the club world cup is when they are declared world champions, they usually win it, but what matters is that they win a world tournament before declaring themselves world champions.
your league is called the National Basketball Association, not the World basketball association.
in football the champions league is the most important club level tournament in the world, whoever wins it is the best team in the world, but that does not make them “world champions”, since it is not a world tournament.
when they win the club world cup is when they are declared world champions, they usually win it, but what matters is that they win a world tournament before declaring themselves world champions.