If CNET was giving the Hopper a worst of show, then it might have looked like a conflict of interest. With that being said, it has to work both ways.
It is most definitely a conflict of interest because CBS says it is. Simply by them saying that, the reviewer can no longer be objective without having a backup job in the works.
It does not have to be a conflict, but CBS made it so.
"Then said I, Wisdom [is] better than strength: nevertheless the poor man's wisdom [is] despised, and his words are not heard. " Ecclesiastes 9:16