Every character on that list (Sammy, Poppi, Nile, and the shark girl) is a character that you don't have to worry about if both doors are closed, that is what the list was about, why would I put Ari and the slomo girl in that list if both could still get you even if the doors are closed? Of course I didn't mention them in the comment about what you didn't need to worry about.
You need to worry about them!
P.S. I literally said in the first line of that strategy "all you have to do is use the plush a lot more often" if you are doing it enough Ari can't kill you and regarding the slomo girl, with most of the other girls unable to get to you with the doors closed you can spend more time on cams watching her which will keep her from getting to you.