yes it's hard to change years of habit. Especially if it is ingrained into muscle memory. The cert may not be worth your time/money, but spending time on the forum (plenty of vid of the drills there), doing the drills and following his plans to help you break those habits are probably not bad ideas. If it was so easy to run "right," everyone would, and there'd be no need. You already have an obvious level of interest/knowledge that led you to it, and asking the question indicates you see some level of truth there. For what it's worth, the book, video and drills helped me cure about 15 years of dealing with recurring shin splints.
Think of it this way: you learned to squat here, and found it valuable. Go over there, read, try the drills and see where it takes you.