Who is "mucking up", in this situation? Certainly not whoever wrote the website on cosmic evolution, they are just using standard terminology to refer to the way the universe changes over time. 'Evolution' just means 'change'; as such, it can be used in ten thousand unrelated contexts.
If anyone (other than creationists) is making a mistake, I would say it's Eldon, by overextending the reach of the theory of evolution. What's all this about "social and civil life"? The theory of evolution has very little to say on these topics, and only indirectly so.
Of course, the creationists are being much greater idiots by claiming that having a word in common means cosmic and biological evolution are part of some "general theory of evolution". But then, they are creationists: saying stupid things is more or less their job description.