The exposed boolean in w3c.json has some default value for public and private repos but it is not clear how it applies to archived repos.

With @plehegar we thought that W3C Groups would not want to advertise their private repositories on their group page and did not thought of any use cases where they would.

My suggestion is that the exposed bit is orthogonal to the archived state, in which case it is simply an implementation decision for the groups page to decide whether to include, display separately or simply omit archived repos altogether.
And if we were to later display archived repos on groups pages then we would honor their exposed value.

@deniak, @plehegar, @dontcallmedom does that sounds good to you?