Comment on ‘Oxygen vacancy-induced magnetic moment in edge-sharing CuO2 chains of Li2CuO2’ oleh R O Kuzian, R Klingeler, W E A Lorenz, N Wizent, S Nishimoto, U Nitzsche, H Rosner, D Milosavljevic, L Hozoi, R Yadav, J Richter, A Hauser, J Geck, R Hayn, V Yushankhai, L Siurakshina, C Monney, T Schmitt, J Thar, G Roth, T Ito, H Yamaguchi, M Matsuda, S Johnston, J Málek, S-L Drechsler