I am not going to talk about Norbert Preining's continuous ranting against Debian's Code of Conduct. Suffice to say that it annoys me, and that I think he is wrong.
I am, however going to mention that contrary to his statements (penultimate paragraph), yes, the Code of Conduct is supposed to apply to Planet Debian as well. Its introductory paragraph states:
The Debian Project, the producers of the Debian system, have adopted a code of conduct for participants to its mailinglists, IRC channels and other modes of communication within the project.
Note the "other modes of communication within the project" bit. Planet Debian is planet.debian.org. If your blog is aggregated there, you are communicating within the project.
At least that's my interpretation of it.