It is possible to do these analyses and isolate a single variable regardless of the correlations with other variables. I'm hoping they did this but their methods section does not seem to indicate that they did.
They have a very large variable space (one variable per question) and they want to reduce that to the ones that are actually interesting. Hopefully they did some sort of dimensionality reduction to find the important variables, and I expect a lot of those new dimensions were comprised of many variables, for example, wealth and money spent on wedding are probably correlated.
They have a very large variable space (one variable per question) and they want to reduce that to the ones that are actually interesting. Hopefully they did some sort of dimensionality reduction to find the important variables, and I expect a lot of those new dimensions were comprised of many variables, for example, wealth and money spent on wedding are probably correlated.