It seems to me Brian's affiliation with Alcor is implied by the wording of the comment. I don't think it is correct (or reasonable) to conclude that he has "concealed" anything simply from the fact that he did not explicitly mention his position there. It is publicly accessible information, after all.

However it is not clear to me why this is such an important fact to disclose in this context. Is the validity of his factual arguments dependent on who says them? Unlike Melody, he has not taken an authoritarian position based on his educational background. Brian Wowk is a PhD cryobiologist who has participated in some of the most important research on cryonics-relevant science to date.