There seems to be two kinds of irony here going in two ways, I feel.
The anti-globalists by their actions seem to be creating a reaction which is leading to less global collaborations. Note the title uses the word "Sovereignty". Sovereignty is becoming more important as a reaction against the anti-globalism movement by those who want to support everyone anywhere working together over thin borders between peoples. In other words, isolationism breeds an isolationist reaction. We might see a stronger European identity versus others as a reaction against America's declaration of their identity over others.
Secondly, on an environmental front, we are seeing a move towards the reduction in global trade and travel between nations, and a reduction in developing world pollution as developed nations manufacture more things closer to home. So there's an irony in that the anti-environmentalists are causing a reaction that will help the global environment!
I do not see the irony as it just isolates the US from the rest of the world. Of course it is a loss for globalization without the US but I don't see that the rest of the world follow the US to isolate itself.
Yes I see what you mean. I suppose the challenge then is to elevate European sovereignty at the same time as keeping free trade, open borders and free movement. In a way the article could be saying "the world needs its own non-US software" without the sovereignty bit.