I think his point is not so much that you should do things the wrong way. It's more that you should stretch yourself and go to your limits. You will inevitably do things the wrong way from time to time when you test your limits, but you will also learn much more than if you just stayed in your comfort zone.

So doing things the wrong way is a symptom of testing your limits, which is a good thing. Of course, you have to be careful. Sometimes, you do things the wrong way out of plain stupidity, so the implication doesn't go both ways.