Only 6 of the 8 World Cup champions (up to the question's context) have won at least one title while playing at home: Uruguay (1930), Italy (1934), England (1966), West Germany (1974), Argentina (1978), and France (1998). Brazil has never won the World Cup when hosting (1950 final loss to Uruguay, 2014 semifinal collapse), making the statement false if referring to 7 champions. The question's math depends on whether it counts total champions or titles won.