Permissions based on a User Value?

[tpmedia]

I am looking after a long running Xenforo site set up by someone else. We have a a forum called Hot Topics for pointless/acrimonious political debates with only some users having access to that forum and I am struggling to figure out how access is actually controlled.
If I Analyze permissions for a user who does not have access I can see that the access is denied by a User Value called Hot Topics (see below) but the question is how is the User Value used to restrict access, I cannot see an...

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Permissions based on a User Value?

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