Thank you for closing that door, allowing me to bash it in (though not to be churlish, I really would have wished for a much less rickety one).
The article accurately self-describes as
Camp of the Stupids, managing to completely miss both the complexities and the simplicity of the issues. It is a classic example of the less you know, the more you're willing to pontificate, and out of place in a web site that purports to be libertarian. (Libertarians, like the followers of any ideology or religion, come in two groups. Those that believe in what they are saying, and those who use it to justify their own interests, and as a vehicle for being offended when those interests seem threatened.)
His most cogent argument, and I am not being ironic, is the one the site chose to highlight,
"To permit mass settlement by blacks who are also Muslims is to pass beyond the bounds of mere folly into homicidal insanity."
It is the only point where he may be a little ahead of the curve. European xenophobia, just like American or Asia xenophobia, will change with migration patterns. The fear of today is Muslims, the fear of tomorrow will be Africans, and yes they will be black. A majority of them will not be Muslim though (more are likely to be Christians), but a large minority will, probably enough to keep up the "Clash of Civilisations" narrative a while longer.
Some of them will pick Asia or America as their destination, but most will pick Europe as it is geographically and culturally closer. I think they deserve better than Europe which has been poor at turning migrants into enterprise.
His lesser points are really
lesser points, but as you mentioned them: OK, he's a naturalised American (Glaswegian?), but what happened to "pursuit of happiness"? Of course they are not starving. Starving people are pliable, fairly stationary, and generally geldorfable. He should grow up (as should Geldorf, not carrying much hope for either). The reason we can expect a rapid rise in African migrants isn't because Africa is getting poorer, but because Africa is getting richer. With growth of wealth comes a growth of ambition, ambitions that generally can't be fulfilled at home, and as mentioned I am not sure Europe is up to it either.