Regardless of the merits of the question itself, I disagree with using MO to debate sociological issues, and especially to advance one's agenda, and this is what's going on in the comments. Of course, precise questions do not lend themselves easily to such discussions, but it is always possible to post off-topic comments. While closure may be entirely appropriate*, it cannot prevent anyone from posting comments, and closed questions can still be bumped to the front page by editing the question or one of the answers, which is what happened in this instance. The answer by Richard Borcherds resolves the issue to my satisfaction, but apparently, OP disagrees. It is always difficult to determine how someone's ideas have been used; lack of publication and open status of the problem they are meant to address are aggravating circumstances: it may well be impossible to "certify" that nothing exists beyond the reference already given.

• Indeed, there have been earlier discussions on the appropriateness of the questions of the type "What is wrong with this paper".