OK, forgive me however, I'm a tad confused ..... Are you commenting about their actual - non - site, for which is used as their "email connection", like a mailing list "service"?? Or are you stating, specifically, how the person from the website is mismanaging the email group?? If it's about their actual site, I would think some kind of "contact us" or "list of administrators" (or whatever) might be found there, with ways to contact if an issue arises.? Out of?curiosity, I tried to do a google search for anything with the name/title you provided, I found a few things, including a YT channel for the person you mentioned .... maybe start at one of those to see about who/how to contact in cases of violations and abuse?
If you are talking about their "group" (aka "mailing list") is being run, then yes, I'd be looking at the contact info for -- most likely it will go to Mark, I am guessing?
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If you are meaning something completely different than this .... my apologies.? ?Whatever/Whichever it is, I hope you are able to get it sorted out.