As I've said before, I've seen a variety of blogs and forums over the years contradicting things you've said here that I've become skeptical.
There are plenty of bloggers who give opinions based on unsubstantiated opinion or misinformation.
And there are blogs with very accurate, verified information.
It's sometimes hard to tell the difference. In this case, the poster is off by several decades in his timeline about the elimination of DJ choice from programming. In another post, you mentioned a Q&A board where people were guessing, all incorrectly, about how songs got on the radio; that one was totally ill-informed people who had no clue about how radio worked.
Heck, there is even a DVD "documentary" that was promoted here a year or so ago about consolidation ruining radio. I bought it and found so many errors in fact that I lost track; the producer had an agenda and nothing was going to stand in his way to make his point... even if it was wrong.
You are just going to have to make up your own mind, keeping an awareness that most listeners don't care how the sausage is made, so they have no insights or knowledge of the process.