I believe that such "answers" should not simply be flagged as "not an answer" because they are trying to bring a potentially bad situation our attention (in essence, they are much closer to being flags than simple comments). If users/reviewers can find information that would back-up claims made in such answers, flagging the question for specific moderator attention giving this information would be the best possible scenario. Otherwise flagging the answer for specific moderator attention saying something to the effect of "answer claims that...." would be appropriate. If claims are borne out, the moderators may be able to lock the question in light of our Contest Problem PolicyContest Problem Policy, or possibly direct the appropriate persons to Stack Exchange's Copyright policy.
In this particular instance I have not been able to find any specific evidence to support the claim made in that "answer", but am trying to reach out to gain it, if possible.