As I stated in the comments in that post, I also contacted Google directly but I asked multiple questions. I had to use the email route not having a direct line to decision makers at Google, but Google have been fairly prompt in replying to my questions.
It seems using other adverts that look similar is out, and Jennifer goes into detail how that can affect split testing, or having adverts from different sources in different parts of your site.
I talk about how you can use UTW quite a bit from an SEO perspective, but it can also help with monetization. If you have keywords, you can use them for all kinds of things.