Nats admins can choose to have sites, programs and tours in their NATS setup hidden or not hidden. Hidden sites track fine but are simply not listed on the aff programs main page under "sites".
This is useful for sites that are in beta testing or for some reason are not offered to all affiliates by default.
I am pretty sure if a site was "removed" from Nats, the link would not work at all, if it is a link to a tour, since the tours are stored in Nats (usually)
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