The author seems to be dismissive at best and flippant at worst concerning Trent. First, if it weren’t for the Reformation in general and Luther in particular, Trent would never have been called, and the corruption in the church that led to the Reformation would not have been cleansed. Second, the Council of Trent led to the greatest expansion of world-wide evangelism the church had seen to date, and while part of that was on the backs of the European explorers who “discovered” the Western Hemisphere and sea routes to south and east Asia, it was also a reaction to the explosion of Protestant missionary work.
In short, Trent established the one most powerful human-based motivation available, in the service of presenting the gospel to the whole world: competition. Xavier got to India, China, and Japan, and the Benedictines got to the Philippines, in large part because they wanted to spread the Catholic version of the gospel before the Lutheran or Calvinist versions of the gospel got there, which is a Philippians 1 situation: whatever the motivation, the gospel was preached, and in that we should rejoice.
I seem to remember somebody saying that scandals would come, but woe to him by whom they would come.