In general, studies on social , cultural, and political topics should be taken with a huge dose of salt until one looks very deeply into how they were conducted and the methodology. There are so many assumptions and biases, usually left-liberal, reflected in them.
Still, I largely agree with this study, from my own experience. The left-liberal media has its shrill and silly outfits - its Buzzfeeds and Salons. But it does tend to have better journalism. The likes of CNN and the BBC have more, better journalism on average than say, Fox. Still, good journalism is not entirely the same as unbiased journalism. CNN, the BBC, the NYT, etc. are biased, and you do have to untangle this bias from their reporting (especially as they tend to prefer soft bias, which is more subtle and insidious). CNN, for example, has gone off-the-plot since Trump one. They don't even seem concerned to maintain their old soft bias, and are now bordering on MSNBC shrill. But they still do good journalism.
There are good right-wing sources of real journalism. Even Fox has some good journalism, such as that done for Special Report or Fox News Sunday. These are biased, but you get decent journalism and punditry, not the shrill silliness of a Hannity.
PBS Newshour is the best news show I know of for combining good journalism with the least bias possible.
