I feel like the headline relies on a misnomer. Sivers is talking about culture. Most culture occupies a geography, even if it’s a changing one; the culture shrinks, expands or drifts over the land. The land itself shifts and changes under the culture. Both affect each other. But what Sivers is talking about is groups of people changing, and someone returning with a snap shot of what used to be. This is a common experience among returning emigrés, and their time capsule abroad is sometimes referred to as cultural fossilization. They removed themselves of the living dynamic body of a culture, and have become unknowingly conservative toward it in their expectations. This has also been noted by authors like Thomas Wolfe (There’s no going home.), and consolidated to a Greek word, nostalgia, which also means the pain of homecoming.