They feigned retreat so that the romans would follow them. Wether you want to call it "giving ground" or "tactical retreat" doesn't matter. Yes, they were beaten, and they would have retreated eventually anyway, but what is so wrong about calling it feigning retreat? They obviously fell back, so that the romans would be caught in their trap. Hannibal had ordered them to fall back.

So what we call it doesn't really matter, but in essence, it's still a feigned retreat.