The page: https://github.com/orgs/SemanticMediaWiki/teams/testers
is referenced in a few places, but can't be found. I don't know what the correct URL should be if any.
Hmm that is weird. Link is correct, but apparently you can't view that page even though it is a "visible team"?!

Apparently you need to be logged in to see this page. I'd say it is a GitHub bug or they changed the logic.
Apparently you need to be logged in to see this page.
Trust me, I'm logged in and still I can't see the page ;) No idea if there's a permission setting somewhere.
It seems 'Visible' is only for other organisation members.

Huuu, this used to be different. :(
As harsh as this may sound: I am inclined to remove this since nobody ever cared to test. Rather leave this to automated testing or arbitrary findings by users.