"This is the first time I've seen this discussion on PM, so as someone who's interested in the concept of anonymous contributions on the internet, I'd like to know where's the place this discussion is actually happening."
Unsurprisingly this section Perl Monks Discussion deals with discussion of the Perlmonks website. The article in question has a comments section should you care to comment on that. Responses to the many efforts from this user have not all been restricted to anonymous posting on this site, but general responses to preserving anonymous posting and issues including creating throwaway accounts in order to post which seems to negate efforts to required an account (and associated identity) to post. Various freedoms/rights groups post content on this subject from time to time (EFF etc). Who do you want to air your opinions to? Which organisation/body are you looking to reach? If you're looking for something specific.