It's not just that the term is trademarked. Susan has concerns that if members disclose too much information from the book, they will stray into copyright infringement. The site would be vulnerable to a lawsuit in such a case and could be shut down entirely. She has made it quite clear that the site is safer without a special board on this topic.
In addition, some of the mods have noted that problems could arise because these substances are unregulated, understudied, and easily obtainable without a prescription. Some people use them without a doctor's supervision, too, and we don't want to facilitate that, especially since some of the substances appear to have some dramatic side effects in some people. Also, members could easily make recommendations to other people about dosages and such. Finally, we do not allow discussions of similar substances used by MTFs, so this is the same situation.
I, too, wondered why we could not have such a board, but I understand now.
I expect that Devlyn Marie posted the TOS notice because this topic has already caused problems on another thread or two recently, and bringing it up yet again looks like a public protest. If you have issues with Susan's preferences regarding a board on the topic in question, you will have to take them up with her. I'm sorry, but that's the way it is.