Insight from a Z player in BW: the idea behind the whole strategy is to shut down all Zerg units while pushing them to their bases. Imagine a flying detector unit which has a decent speed and Viper's Parasitic Bomb which works twice as long, could be cast on any unit and deals damage only to bio ones... Basically it could kill any Zerg unit except the big ones in one cast (because Queens are flying and can't heal in BW) or shut down Muta stacks, ceasing any map control attempts until the counter measures will grow.

edit: wording.

Actually, I meant to share this link containing info that the strategy is named after a player with the name of SoulKey and not for SK Telecom.