All hotels reserve the right to inspect your room whenever they need to. The privacy sign just means you don’t want room service, it’s not some magical lock.
They’d still knock, not just burst into your room to catch you in flagrante.
That said seeing the black hat conference in this way is daft.
When did I say anything about anyone having sex? What?
They're doing visual inspections of rooms because they don't trust the scary hacker people in them. What do you think telling them you're in the room is going to accomplish?
They will come by at a later time. The OP i responded to was making it sound like they will bust in while you are there. I am only saying no, they'll do it when you're not in the room, as most hotels will do already.
What you're describing completely defeats the purpose of the inspections (trying to catch someone in the act of hacking them, somehow) and they were scheduled. Also, you have only replied to me on this post.