The next paragraph reads
When you choose this archetype at 3rd level, you learn
how to land a strike and then slip away without reprisal.
During your turn, if you make a melee attack against a
creature, that creature can't make opportunity attacks
against you for the rest of your turn. -SCAG pg. 135
It further goes on to clarify in a blurb on the next page
This allows you to use your bonus action to
fight with two weapons, and then safely evade each foe
you attacked. -SCAG pg. 136
So while holding two weapons, if you are surrounded you can make two attacks against up to two different creatures and get away unharmed. It doesn't specifically state that it needs to hit, just that the attack be made.