That article doesn't tell you how to potty train a pig, @scoottie. It just tells you how to catch the output if you have a cooperative pig who likes to go in the same places. Some pigs do, some pigs don't. And some who do go in the same place all the time will sleep in the potty bin, thereby predisposing themselves to urinary tract infections.
Pigs can't be potty trained. Some will pick places where they prefer to do their business, and if you put something to catch the output there, you'll get most of it. Those places are usually where they sleep and where they eat. Others will go wherever, whenever, and there's nothing you can do about it.