It was not on PTR, the devs broke it. They later posted anther blue post with this update.
It takes an additional second to realize and comprehend that LFR gear being added through alternative avenues nullifies the need for LFR to be released in Cataclysm. This implies that LFR will be introduced in Mists of Pandaria.
Yeah the devs broke it when they tried to make it a 10man. They did indeed pause working on lfr. But that does not mean that it will be released in cata. They now have 6-7 months to fix what they broke so that it is available for MoP.
This would be ideal; stop rewarding players who quit. It is a vicious cycle. If there were no catch-up mechanics, players would still run the old raids with alts. However, now that there are catch-up mechanics in the game, players exploit the system by buying PvP cloth BOE items, keeping them in their bags(never equiping them), and then sending them between alts just so they can join RDFs and bypass the ilvl requirement, hoping they do not get kicked for poor performance.
Yeah because the devs don’t care they spent all their resources on KZ crypts for the sod players. It only took Blizzard like what 65 weeks to fix the Extra action button they broke in beta.