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What? The Newsletter article doesn't even mention the Belfast Telegraph or Barnes? That's the key point here. You have not provided a single reliable source to support the claims that Barnes wrote this piece. You're basically accusing Barnes of inciting racial hatred without any evidence, apart from web forums. To quote our policy on biographies of living persons:
Wikipedia is a high-profile, widely viewed website with an international scope, which means that material we publish about living people can affect their lives and the lives of their families, colleagues, and friends. Biographical material must therefore be written with strict adherence to our content policies..
I agree Barnes is a hack, but without reliable sources the section cannot remain.  ’Bout ye! "