It's a line open to interpretation. Did she walk away back to Themyscira and completely leave man's world? Probably not given the ending of Wonder Woman. But did she start intervening in every human conflict and being a public superhero? Probably not, because WW2 still happened, the Cold War and tons of genocides still happened without her appearance, and Zod invaded without her showing up. Her absence simply can't be retocnned. She can be operating in the shadows or busy fighting other monsters and whatnot.
You not buying it and stating factually Ben didn't do anything are two very different things.
Man this reminded me they nailed so much of the universe for me.