In the paper commented upon, the electrocapillary curves for mercury in ionic liquids, obtained by static (pendant drop) and dynamic (drop-time) measurement methods, were compared to support the inference about ultraslow relaxation at the interface. Yet, the static, i.e. equilibrium interfacial tensions proved to be more in magnitude (at E < 0.3 V vs. Ag/AgCl) than the dynamic ones, which contradicts with common thermodynamics and casts doubt on the data validity. The reason may be that the drop-time interfacial tensions taken from an earlier study were derived using a measurement model (often referred to as Tate' law), well-known but inaccurate.