I don't want to involve myself in this argument but I will say that I can not see their original post. It displays as just "[flagged]" for me. I don't know if that's the app I'm using or what, but I cannot see the post.
You only see dead posts if you have showdead=yes in your settings.
So you may have seen their comment before it was killed, or you may have showdead=yes in your settings.