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marwel17, I would suggest that the difference between "starred" and "appeared" in this instance is academic; he was a character in the series even if he only appeared in one episode.
Having been a fan of the series in my younger years, I'm aware that he did not have a leading role in the episodes. I've also checked an episode guide and not found him listed as a guest star.
Given the limited number of actors in the series, I would have thought that he would have been listed in the closing credits if only in the part of a minor character on Moonbase or elsewhere. After all, I can't think of a single person in the series that didn't have a name disclosed at some point or other no doubt due to the limited number of actors that appeared. In addition, the actors union EQUITY would not have been happy if his name had not been disclosed
At the end of the day, I can't understand why the part he played should not be disclosed yet none of the obituaries mention it. it's all very odd.