Promobricks removed Fossils from their retiring list in their September update. So maybe the rumor is stemming from that. Stonewars still has it retiring but they haven't updated their list since mid August, so if the change on Lego's end was after that, their list wouldn't show it. Are there any other reputable sources to go by?
I personally think Ideas set retirement dates are very untrustworthy considering what happened with Saturn V, ship in a bottle, and treehouse. Fool me once, shame on you. Fool me twice, shame on me.