This is an interesting video, however I completely disagree. Clicker training is a great way to motivate a difficult dog. It is very effective to mark the exact moment your dog does the right thing, which helps shape complicated behaviors. It is also useful to get your dog thinking and working with you in a lesson.
Of course, I’ve also heard that the only thing you’ll ever get two dog trainers to agree on is that they don’t agree with each other. It takes time, effort, and consist work to use any method of training.