Molemir's Manor only had one of its doors closed, though. The outer, more southern door that could be accessed. You can still (easily) get in via the environment, in a way that looks almost designed to be used that way (I have my theories on this, which I've posted elsewhere). And the manor itself is still open. So that's only one door.
Where's the other? Now that... that is the question.
Well, they have to keep snoopish snoops away from snooping at their changes. Though I do wonder why they closed the door, yet left a much more obvious way in open, along with the door to the manse itself. Peculiar business, that.
Interesting; I assumed it was Molemir's Manor as well, but hadn't actually managed to check yet. Would be interesting to see if anyone has found the other door!
Found it. It's the two outer doors to Molemir's Estate that they are talking about, one on the west side and one on the north side. I think the fact that you can use the environment to get in is probably not intended (at least, not yet).