  In Ref. [1], Minkov et al. reported measurements of the magnetic moment that
remains after a magnetic field is turned on and then turned off for hydride
materials under high pressure in a diamond anvil cell. In Refs. [2,3], Minkov
et al. reported magnetization measurements on the same samples as a function of
applied magnetic field. Here we argue that the latter indicate that the signal
measured in the former does not provide evidence for superconductivity in these
samples. Instead, the measured signal likely originates in ferromagnetism of
either the sample or the background.
