The article specificly says the issue was in code that used to be in tails and isnt anymore. Additionally, the motherboard article describes the payload as a video file uploaded to dropbox, which doesnt sound like webrtc.
0) https://securityaffairs.co/wordpress/43442/cyber-crime/fbi-u...
> and tails uses tor browser which doesn't support webrtc.
and how (in other instances than the situation in the article) the WebRTC flaw could be used. I wasn't specific enough.