Hold on a second there sorce. I'm not hating on Dario whatsoever. In fact, the artist has nothing to do with my questions. Someone posted an "update" but it appears the only current photo is the front. That shows us very little about the work and, in fact, tells us nothing about how well the technique worked. So I ask some questions for clarification. Now you say I'm blind and hating on Dario. I sure hope you are trying to be funny or sarcastic with your post.
Looking only at the front, you will never know whether the artist clamped the back to the front or carved off the back. Maybe I'm wrong, but I thought this was about the technique employed to make the tree and not about how to make the best front. If it was the latter, then grow a leader, pump it up, and carve taper in the back.
Give me a hundred cedar elm stumps like this and I'll make some great trees. I probably won't do what Dario did but that does not make him wrong or me right, or vice versa. Cedar elms grow like crazy, and I'm confident that I can take a stump like this, create taper by sawing and carving and heal it over completely. I'm also confident that doing so will never make a believable tree, but it will make an awesome bonsai. I love sumo bonsai; they just don't look like trees, but that's 100% ok with me.
If the premise of this thread is simply: is this a tree without potential? The answer is: No. It should not surprise people (interested in bonsai enough to participate in a forum like this) that this is how many bonsai are started.