I believe the poster you quoted is aware that the room occupied sign exists. The point is that the sign no longer means "Do Not Disturb". It simply alerts a person outside that there are people in the room. With the security checks, no one can expect the sign to prevent them from being disturbed anymore.
No one said DME would alert housekeeping of departing guests, but the point I made is that housekeeping may be privy to DME departure times through the same reporting that they receive each morning letting them know which guests are due to check out. I can't confirm this, but they have to prioritize the rooms they need to turnover, so it would make sense they possibly have access to this information.
Anyway, the issue isn't whether OP would be permitted to remain in the room until 11am. The issue is just preventing OP from being disturbed at 7-8am when housekeeping is starting up. But even if the OP is listed on the reservation, housekeeping can and sometimes will knock early regardless.