If there are no hard measurements I can use to determine the value of "clean code" then I fall back on the results of produced by people who say they are writing clean code. There is no realistic way to objectively measure coding styles completely isolated from the people writing the code.

I personally haven't seen value from that coding style. There may be some platonic ideal clean code that is better than other methodologies in theory--it is likely that my sample is biased--but from what I've seen, the clean code style tends to lead most developers towards over abstraction.