  The present Comment demonstrates important flaws of the paper Phys. Chem.
Chem. Phys. 2022, 24, 11958 by Opodi~\emph{et al.} 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~\emph{et al.}
claimed that method 2 is inapplicable. As for method 3, the parameter range of
the applicability map is beyond its scope, as stated in papers cited by
Opodi~\emph{et al.}~themselves.
