What relevance does his personal opinion on homosexuality, expressed on his personal blog, have to his participation in an OSI mailing list about open source licensing?
No, he's not. He's fighting against codes of conduct because he sees them as a Leftist attempt to gain control of open source software as an institution and subvert it, in other words, a Leftist power grab. This is not by any means the first such Leftist takeover in history. You can agree or disagree about his reading of what's going on, but either way it has nothing to do with normalizing homosexuality.