In the later period of that book, he probably wrote that it "collapsed a bit," and it had something to do with Yang, but most of the responsibility lies with him.
It's his fault. He has betrayed everyone's trust. He really can't afford to be wrong.
He didn't delete any criticisms. The book would be finished in a while, and he would read the comments after that.
Learn the lessons from that book and don’t make those mistakes in a new book.