Wikipedia:Citing_sources#When_to_cite_sources says "...To help users find additional information on the topic." And Wikipedia:Verifability says "Self-published material may, in some circumstances, be acceptable when produced by an established expert on the topic of the article whose work in the relevant field has previously been published by reliable third-party publications." This blog is written by Isaac Freeman, editor of Funtime Comics the longest running anthology in New Zealand. He is a reputable, third-party publisher and as close to a comics professional as there is in New Zealand - remember we're talking about a country with more marmite than people.