I have never seen this auto-message. I see it on this diary.
I will assume that this is not a feature, but a glitch. The diary in question is not different from the other Hillary v Sanders diaries.
Again, I assume this is a glitch. I used to program. Shit happens. You envisions a scenario where the phrase “comments are closed on this story,” as as all things not beta-tested, the users inadvertently trigger the phrase.
So if you saw this message, also, let me assure you that it’s probably a programming error.
Right, boys?