I have gotten trees to fall perfectly where I wanted them many times using a hinge to guide the fall. Getting the hinge close to the right direction is easy, and then it falls precisely across the hinge close to where you want it. ... But it does take some luck to eyeball it perfect. - Then it falls perfect unless you are unlucky by having defects in the hinge wood.
,,,,That said, the margin for error in the video was so small, and the consequences so great that eyeballing is ridiculous. Only with instrumentation to align the hinge would I be confident in a true fall required of +/- a degree. The video shows better than that - essentially perfect placement.