This is a textbook example of the Margaret Mead effect. I can't think of any other reason they would have hidden it from view.
Right; the Margaret Mead phenomenon where primitives, once they're aware they're being observed, either change their conduct or hide it.
It's all anthropological; what we have here is that the primitives, having been infiltrated and all is falling apart around them (i.e., the current political environment), retreat further and further into the interior of the forest, huddled together in the darkness, sweating in fear.
It's happened since Time Immemorial.
While it presents--temporarily--a minor nuisance, it doesn't especially bother me, the hiding of the forum. I'm surprised my fellow alum Skins took so long to do it. I figured he would sooner or later, but I didn't think it would take this long.