So it was, although it should have been in Google, not SEO, since the article is specific to Google - that's why I couldn't find it. I assume the moderators will merge the threads or delete this one.
I see one thing missing from the list is domain age. I believe it also plays a major role in competitive serps.
I find this point very interesting. Actually, when you look at WordPress Posts the title's are h2 and not h1.
Thanks for this good info. I wasn't aware of the fact that H1 don't count in Google. That's good news, as all my blogs run on wordpress.