Not sure what are calling false. The info I posted is correct. You must have "Ask to Join Networks" cut on and are accidentally hitting OK when they pop up. Just cut this off and you will NOT even be ask to join an unknown WiFi. Of course you MUST still "Forget This Network" if you have (accidentally) join it.
The only way your iPhone will join automatically to an unknown WiFi is if you have a Profile setup like for Xfinity.