I don’t think you can remove someone from the forum unless they break the rules multiple times. But you can always ignore him, just go to his profile and click the “Ignore” button.
Personally, I feel Cenuck78 mostly shares facts based on official data and timelines. His comments, whether positive or negative, won’t affect anyone’s application timeline. Sometimes they might sound a bit discouraging, but he has also shared a lot of useful information and insights over time. He’s been here for a long while, so he probably knows more than many of us.