There's no reason for it to be featured anymore—it's locked and there's nothing we can do with it. Nevertheless it's still showing up in our Featured on Meta sidebar.
It looks like this might be a bug, honestly. When I say there's no reason to be featured, I also can't imagine on a technical level why it's still “featured on meta” either. There is some caching in the sidebar, but not this much. It's been a whole month since it was un-featured. It would be really weird for it to just ... stay there indefinitely.
Could a Stack staff member please take a look at this and correct whatever's keeping it there? (And would one of our diamond mods be kind enough to give someone on staff a lil poke about this?)