it is like the method Moe used. I think it can be portable with practice but you have to have the practice in the different sands on the courses you play. When you use the bounce the club is freewheeling through impact. That's not the case with the square method so you need to know how hard to push to get the clubhead through the sand.
But when you get it...I noted right after my refresher with Scott how sharp and clean his divots in the sand were vs mine. Sharp and clean and CONSISTENT including a consistent depth (about 1/2" below the surface).