No, adding caboose cars would not work. The trains are so long now that the cumulative slack in the couplers adds up to several meters, which causes a tremendous jerk when the slack gets picked up at the back of the train.

The real point of the article was to talk about electric brake systems, which use air to power the brakes combined with an electrical control signal. With this approach, the brakes can be applied to all cars at the same time, and modulated for better control.