I didn't say anything about pre-Watergate eras. The "current era" is the one that we're in, the one since the rise of Fox News and the conservative media. Before that, CNN, the NY Times, the three major networks and such ruled news media. That was the era of the "liberal media." The column is trying to erode the notion that that era leaned left and pointing to evidence in the current era (ex. business dealings in 2017). It's a highly dubious argument. If it had simply argued that there is no general liberal bias in the media today, that would be a much better supported argument, but it got carried away.
This isn't that complicated. For a few decades, especially during the 90s, the mainstream media arguably leaned left, and conservatives saw how effective controlling the news could be and eventually countered by launching Fox News and buying up other media outlets. The media landscape is now completely different than it was 20 years ago, but, for some reason, stubborn folks on both sides insist on hanging onto their old beliefs. Many liberals continue to deny that there was ever any liberal media bias in the first place and many conservatives still complain as though it still exists as strongly as ever. It's all just attempts at spinning the narrative to fit an agenda.
Maybe ThePhoenixx, Mach85 and I are all the same person who is just that disagreeable as to argue with himself. Have you thought about that?