I haven't read the article, but it sounds like the guy is trying to think outside the box a little bit. I can see how if weight is added to the right side, that side of the plane will accelerate more slowly, causing a right yaw in order to cancel the left yaw caused by the propeller. The uneven wing loading will of course affect stall characteristics with the engine off. Hmm....what if the wing area was also increased on that side? The added weight and drag from that could allow for some of the other wingtip weight to be removed and the idea would be to keep an even wing loading. I think the Macchi 200/202/205 series fighters from WW2 did something like that, with one wing longer than the other one.