'Progressive understanding' has always been something they promote. God reveals things in due time and helps the GB to figure it out. When they are announcing these changes, they promote the idea that Jehovah has blessed them with this knowledge.
But, now and again, they also explain that they are just human and can get things wrong. Which raises all kinds of questions. Is Jehovah this bad at getting his message across to his F&DS? Can we trust anything they say, when they admit that they can get it wrong at any time? How can they justify DFing people for apostasy if those people are the ones who got something right? And so on.