No it doesn't. If it did, bodybuilders would have discovered it years ago. And I honestly have never seen any guy trained by Glenn that looked like what I call "jacked". Understand that he worked mostly with Olympic lifters who were not used to more localised/higher volume work. So its addition, regardless of if it was eccentric-less or not, would have led to hypertrophy in that specific population.
The one benefit of eccentric-less training is that its much easier to recover from (very little muscle damage) so they would allow you to train a muscle more often. So add extra work it might be beneficial, but by itself its is not great at maximizing growth