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European police say KidFlix, "one of the largest pedophile platforms in the world," busted in joint operation.
(www.europol.europa.eu)
This is a most excellent place for technology news and articles.
it says "this hidden site", meaning it was a site on the dark web. It probably took them awhile to figure out were the site was located so they could shut it down.
Not just on the dark web (which technically is anything not indexed by search engines) but hidden sites are specifically a TOR thing (though Freenet/Hyphanet has something similar but it's called something else). Usually a TOR hidden site has a URL that ends in .onion and the TOR protocol has a structure for routing .onion addresses.