On the basis of an objective fit to 443 appraised measurements of frequencies and wave numbers of pure rotational and vibration-rotational transitions of ArH+ in six isotopic variants, 19 fitted parameters - 12 for potential energy and seven for extra-mechanical effects - suffice to reproduce these measurements within experimental uncertainty, <()over cap> similar to 1. Careful analysis of these parameters reveals that, whereas a rough estimate of rotational g factor is consistent with both previous experimental and computational results, no sensible estimate of electric dipolar moment is derivable, despite Molski's claim to the contrary [Chem. Phys. Lett. 342 (2001) 293]. Deficiencies of Molski's analysis are discussed.