2. Tell people your competition sucks - unethical.
4. Seed your site using Mechanical Turk - unethical, depending on the type of site you have.
5. Have a blog - should be 'Have a Popular Blog'
He leaves out useful techniques like twittering about your new site using popular hashtags associated with its subject. Or posting it on Facebook, creating a fan site and encouraging your friends to spread the word.
I can see that using Mechanical Turk could be unethical for certain sites (e.g: dating sites), but it could also be pretty useful, and was something I hadn't thought of at least.
Also, I don't see how your complaint about #5 applies to blogs but not twitter or facebook sites.
As for #5, yes for a Facebook group it would need to be popular. But with twitter you can attach relevant hashtags to your post, resulting in it showing up in searches as well as for those that follow you.