If you give a microphone to random people in the streets, you will hear a lot of strange statements, not all of them correct. Politicians still need to somehow address the general sentiments expressed.I must say that after reading the (IMO not very well written, with lots of grammar mistakes) article, many of the arguments given do sound like arguments that are propagated by the right wing, but possibly not correct (same thing happens in Germany all the time) to me.
But then, I would see things differently, as I am more left-leaning obviously.
In Europe in general, neither the Left nor the mainstream political parties have any convincing responses or solutions to the concerns many people have on issues related to immigration, Islamist extremism and terrorism. When Christians in the middle east (who share cultural ties with Europeans) are being persecuted and massacred, all these politicians can offer are condemnations. And again, when people in our own countries are being murdered in the streets by Islamist terrorist, the politicians can only condemn and wave their fists. However, they are not seen to be doing anything real about the underlying problems. People fear for their own safety, but they also fear that their "European" values (tolerance, gender equality, trust between groups, ...) are under threat.