Board Thread:Support Requests - Community Management/@comment-45418046-20200914054523/@comment-1038387-20200914064006

Yes, that tag relies on Special:WikiActivity.

And it's not deleted or removed; it's technically "not added", as it was a custom feature written on old code. They're looking at making some additions to make Recent Changes easier for at-a-glance patrolling, but it's not coming back.