From that list I don't see HN being affected, although I read somewhere that a report button on user generated content was required to comply for smaller sites.
I think it's hard to make the case for anything other than a pretty tiny group or organisation that that you can get away without having some reporting and moderation process.
I don't think you need a report button but a known way of reporting things by your users is likely going to be required if you have a load of user generated stuff that's not moderated by default.
I don't think you need a report button but a known way of reporting things by your users is likely going to be required if you have a load of user generated stuff that's not moderated by default.