The question is, does it slip or not. Nobody has demonstrated it does, or talked about it doing so, or not doing so.
However, it does appear, although the first picture is harder to see, that the loop in the picture they released today is larger than the one on the door picture in October, which would suggest the loop DOES slip, and that somebody made it bigger.
The key to a noose is that if you pull it through, it unties. If it doesn’t, you did it wrong.