Is there a typo in the header "Matrices with no nonzero entires correspond to complete bipartite graphs"?? Shouldn't it be "Matricies with all nonzero entries"

Is there a typo in the header "Matrices with no nonzero entires correspond to complete bipartite graphs"?? Shouldn't it be "Matricies with all nonzero entries" or "Matricies with no zero entries"?