I reported them for harassment with the following statement:
The purpose of this group is to review bomb any game that has gay representation. Their discussion threads talk about using other platforms to discriminate against LGBTQ+ communities and individuals to circumvent Steam’s TOS policies. This type of behavior promotes discrimination, review brigading, and toxicity. It is surprising Steam is tolerating such open homophobia on this platform.
The OP was recommended this list despite not being a member of it because of the way that curator list recommendations work. If these kinds of discriminatory lists are allowed to promulgate, they could create a culture that is undesirable for Steam as a platform and harmful to LGBT creators, which is why Valve can and should censor these kinds of lists.