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In a recent work devoted to the magnetism of Li$_{2}$CuO$_{2}$, Shu et al.[New J. Phys. 19 (2017) 023026] have proposed a "simplified" unfrustratedmicroscopic model that differs considerably from the models refined throughdecades of prior work. We show that the proposed model is at odds with knownexperimental data, including the reported magnetic susceptibility $\chi(T)$data up to 550~K. Using an 8$^{\rm th}$ order high-temperature expansion for$\chi(T)$, we show that the experimental data for Li$_{2}$CuO$_{2}$ areconsistent with the prior model derived from inelastic neutron scattering (INS)studies. We also establish the $T$-range of validity for a Curie-Weiss law forthe real frustrated magnetic system. We argue that the knowledge of thelong-range ordered magnetic structure for $T<T_N$ and of $\chi(T)$ in arestricted $T$-range provides insufficient information to extract all of therelevant couplings in frustrated magnets; the saturation field and INS datamust also be used to determine several exchange couplings, including the weakbut decisive frustrating antiferromagnetic (AFM) interchain couplings.

Comment on `Oxygen vacancy-induced magnetic moment in edge-sharing CuO$_{2}$ chains of Li$_{2}$CuO$_{2}$'