Board Thread:Theories and Speculation/@comment-32617252-20170720024552/@comment-1512913-20170720085454

Naruto technically wasn't and still isn't the jinchuuriki of all the Tailed Beasts, he just received little bit of chakra from each of the other eight, but they have at no point been sealed in him. So it seems in the Canon, the term jinchuuriki gets loosely used even for those who just have some Bijuu chakra in them, even if not the actual Bijuu.