That article obviously uses very loaded/weasel type wording as one would expect. To be objective, I think there's some semi-mystical nationalism about some of the wording of the party's objectives which I would not necessarily support. It's just that a lot of people are dissatisfied with needless immigration, the mentioned bailout thing and related EU issues and such and hope to find some relief. The pool of people who would subscribe to "nationalism and xenophobia" would likely be far higher if the media did not do everything to shame people who doubt the virtues of multiculturalism. In addition, there are masses of people voting and acting in other parties who have doubts but who feel they have to stick to their party because they disagree with some other key issues. I suppose it's not much different from America.
It can also be argued that other Northern European nations either don't have enough immigration to count (Baltics; are still highly homogenous) or/and that their immigration legislation is more strict, as is supposedly the case in 'true' Scandinavia, particularly in Norway, Denmark ("far-right" party third biggest like in Finland) etc.
Sweden's representation may be a bit different but people's opinions are not.