It's a pro-union article, I think most people can realise that by reading it and decide for themselves whether they support or oppose it.

If you have a point to make you should make it. I have no idea who this is (or why what is on his wikipedia is relevant) and I don't know what you mean with (what I assume is euphemistically stated) "contextualised".

So we should judge the author's personal life and political leanings and history, rather than assessing the content on its own merit?

Is that what you mean by contextualizing the domain and author?

I think the article stands pretty well on its own.

Is there any author of any article who does need to be "contextualized" by your standards? Are there authors out there that exist outside of a context?