The prima facie case is there. He writes racist articles. You are aware of his comments regarding the National Front. His later comments made dodgy references to Muslims. Now show us where he has retracted or repented such views.Actually don't bother, because I doubt such evidence exists.
What is relevant though in a thread titled 'free speech' in the UK is that the New Statesman was entitled to come to a view that Scrotum is a racist, based on his works , and was entitled to publish those views (as 'free speech'). The fact it was , in part a hatchet job does not detract from that, nor the issue that this would embarass his employer . After all, as I have pointed out much of the UK press lies in order to promote some political point and have done for decades.