By your very own logic the editorial board/owners of news media have a financial interest in discrediting the idea of collective bargaining and profit sharing in the public eye, instead promoting free-market ideas at all costs.
If you claim they don't, then you can't draw that conclusion for unionized journalists either
Of course, the owners are not going to support restrictive labor relations laws that are directly aimed at reducing their private property and contracting rights in order to enable their employees to extract above-market wages from them.
But it's pretty hard for owners to prevent this kind of outcome. You are legally restricted from exercising your right to free association and only employing people who oppose unions, if you ever become an owner.
If you claim they don't, then you can't draw that conclusion for unionized journalists either