I think it hit the bump limit.
.flow's theory thread certainly does fill the "stupid" prerequisite though
Either way, here's where the mechanics are explained http://uboachan.net/sugg/res/533.html#559
Just scroll down to the
bottom of the document at http://pastie.org/private/3x9tktr3yithzjllmbg8qw
to read the specifics of the modsage feature
Confirmed that the thread isn't modsage'd. Current bumplock limit is set to 250 replies, which the .Flow theories thread has exceeded.
What about Pipi thread?
I can't see it at all now.
The only way I can see it is if I go through a link in the newsfeed or a direct link or something, I can't even see it in older pages right now.
After waiting a few hours, I am now able to view Pipi thread.