I could give you examples of bias in reporting too, but when you look at a website as a whole, opinions are inserted right next to regular articles, and they're often hard to distinguish. This opinion piece is written a lot like a journalistic article, and has the same style of quotes and facts to make it look objective. It's not that different from including native advertising in with regular articles. Sure, there's a "sponsored" tag in there if you notice it, but it works with the rest of the content to create a narrative and bias you toward interpreting facts a certain way.
Anyway, my point was to show how sources and facts can push an agenda.
That is an opinion piece. A lot of people seem to be conflating opinion pieces and reporting. You can't use opinion pieces to prove bias in a newspaper's reporting.