Per-site meta's get their own separate batch of custom close reasons from their respective main sites. This is awesome. Unfortunately, the default text is a little bit nonsensical.
This question does not appear to be about on-topic, within the scope defined in the help center.
I too would like to see more questions about on-topic.
The default should probably read something like
This question does not appear to be about $SiteName, within the scope defined in the help center.
(If, for some reason, the default cannot be changed, consider this a gentle nudge to all of you site-moderators!)