You have to go back to the original source sometimes rather than just going on secondhand forum chatter.
The FAA is a little more careful with their choice of words.
Here's some of what the FAA actually says is:
that model aircraft flights should be flown a sufficient distance from populated areas and full scale aircraft, should be kept within visual line of sight of the operator.
or ...
Keep your sUAS in eyesight at all times, and use an observer to assist if needed.
Here's where you can find out what the FAA says.
Recreational Users | Know Before You Fly