was it ten years of catastrophe or ten years of difficult exploration?

I just read on we chat that all of the new history text books that were issued this semester were recalled without explanation. This was interpreted to mean that criticism of changing references to the Cultural Revolution as “the ten years of catastrophe (十年浩劫) to the ten years of “difficult exploration (艰幸探索)” had successfully pushed back Xi Jinping’s attempt to revise history. At any rate, students were told to go borrow copies of last year’s history books, while the new books are recooked.