I don't think it's going out of its way to hide the fact that it's an opinion piece. I wanted to highlight to someone unfamiliar with the case and issues (however few that may be around these parts), that it is an opinion piece. It makes assertions through a lens of a bias to one side of the case. There's nothing inherently wrong with that. Using the word "bias" isn't intended by me here as a slight - we're all biased to a greater or lesser degree about everything. But a casual reader should be aware of it without having to e.g. navigate to a separate "about" page :)

Perhaps your highlighting an obvious fact is itself evidence that you do in fact have an opinion and did share it while saying otherwise, possibly unconsciously.