The paper you're talking about is "Deal or No Deal? End-to-End Learning for Negotiation Dialogues" and it was just AIs drifting away from English. The crazy news article was from Forbes with the title "AI invents its own language so Facebook had to shut it down!" before they changed it after backlash.
Not related to alignment though
https://www.forbes.com/sites/tonybradley/2017/07/31/facebook...