User blog comment:Thundermaker300/2018 Roblox Wiki of the Year/@comment-30486079-20181111154426/@comment-4360159-20181111214507

What you are referring to is indeed correct for unsubscribing from Message Wall notifications, Thread notifications, and scrubbing pages from your watchlist.

For the new-ish Announcements feature, the only documented way to "unsubscribe" from a wiki is 90-days of local wiki inactivity.