This is the exact same because "conspiracy theorists might use it" reasoning just flowing in the opposite direction. Conspiracy theorists with conspiracy theorize regardless of the level of transparency provided by journalist organizations.
Knowing when an article was written is a useful piece of information that is being destroyed by these always evolving articles. It might not be full on Orwell yet, but these always-mutating-articles are opening the door to an Orwellian future.
We need to be able to go back and look at the past unfiltered and unmodified.
It doesn't. That was my point. I wasn't praising or criticizing NPR. I was saying that conspiracy theorists shouldn't be a reason either for or against transparency.