I lit up that spawner when I first found the dungeon, intending to use it as a trap for players (as us Zerglings are known to do), but never ended up using it. As far as I know, none of us used it for farming. I destroyed it today at any rate as I don't see us using it.
As for the x-ray hacking claim, feel free to follow my series of tunnels behind our base (most of them on diamond level) Believe me, if Zerg was xray hacking, we'd have a lot more than the 15 or so diamonds we've managed to scrounge up.