The present Comment demonstrates important flaws of the paper Opodi et al. Phys. Chem. Chem. Phys., 2022, 24, 11958 Their crown result (“applicability map”) aims at indicating parameter ranges wherein two approximate methods (called method 2 and 3) apply. My calculations reveal that the applicability map is a factual error. Deviations of I(2) from the exact current I(1) do not exceed 3% for model parameters where Opodi et al. claimed that method 2 is inapplicable. As for method 3, the …