Two-factor authenticator applications should be using UTC, and not the display time. I think that's what the parent comment's point was.
And the UTC would be wrong.
Right, but these phones have the wrong UTC, if I understand correctly. That's why they are in the write-up. Wrong local/display time is pretty hard to detect, unless you have coordinate data.
Given that, two factor where the second factor is a local authenticator program is not exactly a common thing.