Upon further inspection into the users profile they do not have premium, leading me to believe that the system is no longer taking items off - sale when premium expires.
I just read through that post, and it seems like some people are still having issues, but I believe the whole thing is unintentional, as in the past, Limiteds have always gone off sale if a user’s premium expired, which would also be the reason why the “take off sale” button would be greyed out, as that also functions as the sell button.
We won’t be able to know for sure until we get a response from the catalog team, however.