If I remember right, one of Diana's patron deities is a hunter goddess. Insofar as hunting requires stealth, it makes sense Diana could magically sneak up on anyone she wants.
Beyond that, when you're dealing with someone whose perceptions are so messed up that he sees a seven foot tall monster with spikes when he's looking at a shapely 160 pound woman, there's no cause to say WHAT he's hearing, let alone whether such would make a difference or not.
Either way, Q99's point holds, Greg Rucka himself said Superman gave Diana absolutely everything he had in that encounter, yet she survived, and moved on from it.
It's a moot point, besides. Most fans are not aware of this, but Rucka was actually employing an altered re-telling of Justice League of America #207. There, Superman fought against Wonder Woman's equal AMAZONIAN counterpart, pre-Crisis Earth-3 Superwoman. Who cleanly knocked him out.
Examine the following. You'll have to TRY to miss the similarities between this encounter and that of Wonder Woman 219.