I know it's no fun, but please try to remember that the overwhelming majority of the time, the explanations for these things are really boring and standard. In this case the thread set off the flamewar detector.
Or is it more likely there is a basic filter that blocks conversations against the interests of said party? Forums are transparent, when threads are locked /deleted / moderated it is egregiously obvious and publicly visible. HN operates Gestapo style and then tries to gaslight you that nothing happened.
More to the point, it's completely neutral with respect to the content of an article or the comments.