I'm aware of that incident. Quilliam allows its staff to write whatever they want on their own time and it's a representation of that person's views, not the organization. They didn't vet the article. In response, Tommy Robinson barged into their offices and threatened people. The guy is a ####ing nutbar. Which should be obvious enough when you see crap like this:
If that isn't extremist xenophobic nonsense, I don't know what is.
I should note that Khurram Butt, one of the London attackers, was reported to police by Nawaz's organization as an extremist for attacking their head of Islamic studies. The police knew who he was.