I don't think that's the point of this article. The point is that you need to be able to talk to your co-founder about technical and non-technical problems. It's not that you should become so technically sufficient so that you can be the technical co-founder, but so that you can speak the same language as your co-founder.

In six months you can easily pick up the basic ideas need to converse with someone about technical issues, and at least understand what the other person needs. Maybe you'll even learn enough to help out and create the demo, or something.