I read the page. At first I thought there might be a question somewhere there. Nope. It is simply showing how to optimize for buyers instead of DIY'ers and how to get split test results by using multiple ads.
Those are two good, basic points to keep in mind when using PPC. A lot of people seem to think one ad is sufficient for determining if PPC is worth investing in or not. They are clueless about the importance of making decisions based on accurate metrics, not based on 'a feeling' that PPC is working or not.
I've not taken my agency Adwords tests yet. Am afraid. Not yet seen the test so despite reading and more reading...I’m still scared of failing. Or not doing very well. I've heard the test has outdated questions on it still. Not good.
Anyhow, links like this one that you posted are good to read to keep in mind what we know and don't know. Plus, keep us aware of the need for using solid well throughout strategies when creating campaigns.