Those big arse swim baits were designed for Western US lakes where largies feed on stocked trout. Mostly in California I beleive.
That being said, I've heard of a few incideantal largies caught by toothy anglers but yet to hear of someone patterning this bait for largies here.
Now swimbaits in the 5 to 8" are killer for largies here. Cast them out and reel them in like you would a spinnerbait.