There was a sefer from Rav Kook put out this past Elul. It had a perush and was advertised in Lakewood shuls. I’ll track down the author for you. There is no Rav Kook propaganda arm in America. The only people pushing his ideas, are those that picked them up first hand from his writings. Which further proves my point.
But either way- your quibbling around the point. The yeshiva is much more open to outside seforim than it ever was. And unfortunately it is losing familiarity with some of it’s own core Sefarim.