Craig asked for them to be removed from the sidebar as nobody was using them and he felt that the same old topics just cluttered the site. Very shortly after you decided to use it!
There are multiple mods and different mods will make different judgements. The same mod can make different calls at different times and not all comments are even read by all mods – some might be read by no mods at all until attentions is drawn. I can guarantee you the poster you mentioned has previously contacted Craig to complain about their posts being deleted when ones attacking them stayed. It’s a bit swings and roundabouts but individual posters don’t see the whole picture. If we had a table of top-10 most moderated users you would probably be surprised.
In any case the comment you pointed out has now gone.