You actually think his haphazard wrap of epoxy, fiberglass mat, and wire is going to make any difference, one way or another, to the future progression or not of that headset crack?
No, and I believe my first post on the thread reflects that. I don't think it'll help much, though it might a bit. As I posted earlier, as the proud owner of 2 bikes with the same problem, I've elected to do nothing at all (for now). The OP's method may be better than my do nothing approach, or it may not. But I'm pretty confident it won't do worse.
However, I don't criticize people's DIY solutions on their own bikes, unless I feel obligated to warn of a clear and imminent danger. It's their bike, and their own decision about what makes sense, and they're the only ones the decision affects.
So, let's take your premise that the crack will continue despite his repair. So, what will happen? and why all the criticism on this thread? Even if we assume that the totally split tube is some sort of safety issue, the fiberglass windings may act as sort of a safety net, so it's not all bad.
In summary, while I'm not in the OP's camp regarding his repair, I'm more for him than against.