I hate everything RS, but considering the maturity level of the average RS poster, I wonder if there has been too much trash-talking, and when one member complains to the mods, the offending poster was just editing his/her comments to avoid being bounced from the forum.
So they have decided that you can only take back your nasty words for 2 days, after that, it's carved in stone and if you're gonna get in trouble for it, then so be it.
Maybe they are aware of the reputation the forum has and they're hoping that this lock-down approach will help clean things up a bit.
I love how in the thread, one of the posters is like "we have the right to blah blah blah" and the moderator's response to that was like "let's not get into what rights you have on our board" - hehe nice!