yeah, you have to read the entire display label very carefully.. I am willing to bet it says "GUAVA JUICE cocktail" on the label or some such.
we have the same restrictions in the US. it can only be called juice if it is primarily made up of the juice it is called.. otherwise it has to be called drink, cocktail, or somesuch. they can still use juice in the name, but then it says "guava juice cocktail", guava juice "a refreshing drink", gauava juice "a refreshing juice cocktail" or somesuch.