I feel like they were probably made aware of it at some point (maybe before the feeds started? - although it wouldn't have been as bad then) but if they haven't mentioned it on feeds then they probably aren't supposed to talk about it in there... Micheal didn't seem too surprised by no audience or like even bothered asking why.
It would explain a bit why this cast is so damn emotional tho, as they're worried about what's going on outside the house
