That method is way to complicated, no thanks, I will stick with El Burns way. No extra folds, no cutting thread. You just sew to 1/4 in from the corner turn the quilt then backstich off to batting, raise the needle do the fold then continue stiching. Works perfect.
She has a demo on the website. Quilt In A Day. In the upper right corner is the search button, put in video, that takes you to a screen with a menu on the left, click on television and video.