  I agree, the structure is incorrect. In addition to the electroneutrality principle, which predicts that electrons will be distributed in such a way that the charges on all atoms of a species are as close to zero as possible, Linus Pauling noted that if a negative charge is present, it should reside on the most electronegative atoms. The Pauling electronegativities of nitrogen and oxygen are 3.0 and 3.5, respectively. Therefore I would predict that the structure would be K+ O- (single bond) C (triple bond) N.   