It's an idiom/manner of speech (albeit a very rare one; you'd never hear a person actually say something like this). Basically, it means to make something eternal. If you kill death and time, then there's nothing left to destroy whatever you've made, and thus it lasts forever. This is something you'd hear regarding, well, a piece of art. Delft is an area in South Holland. So either the sentence means that this is a piece of art literally located IN Delft that is itself immortal, or it's a piece of art that immortalizes Delft in paint. I'm guessing that it is using Delft just as a location, however. If my guess is correct, then I'd rewrite the sentence like this: "...how one Dutchman's paintings, located in Delft, immortalize their subjects." I'm also guessing the Dutchman in question is probably Vermeer, but I don't know enough of the story to know if that's correct or not.

Delft - a city, the birthplace of the great Dutch artist Jan Vermeer. He appeals to a joyful and peaceful human being. To convey his feelings, Vermeer deliberately simplifies the plot, embeds his characters in quiet meditative poses. It is as if time stops, to give yourself the opportunity to learn and to know the subtle harmony of the world. One of his most famous paintings - "Girl with a Pearl Earring." Today, the majority of his works are increasingly added the epithet "priceless."