I started training a year ago with a sprint coach trying to improve in the 800m, it was weird at first because we weren't doing any base or at least mileage base we were doing strenght base, circuits, hills, weights, etc.
The training in my opinion is great but it lacks distance, and think even the 400/800m runners need some distance. Let me explain why. The first competition we ran it was a disaster, all the 800m runners died in the 500m mark, we felt great going out fast but just couldn't hold after the 500m mark.
At the time we were doing repetitions faster than 800m pace 300 mostly, something they recommended here the 20 easy then 6x100m but the 20 easy were after the 6x100m, 600m at race pace etc, our longest run was 30 min steady running I mean.
After this race the number of repetitions increased and the average time we could hit got lower, then we race again, it was not great but our times were getting a lot better, and we felt better than the previous time , the starting the competition period 5 of 6 of us got injured, proabably because we werent asked to do nor gym and well we lacked the base, I myself couldn't run for 3 weeks, but here's an interesting thing that happened, one of us got injured, but not so badly, so the coach tried to maintan his fitness by doing some long easy runs, 3 weeks he trained like that, after 3 weeks we had a competition, he wasn't really eager to compete but we convinced him, boom 2 seconds pr, from no speedwork at all, in 3 weeks.
My conclusion about this is that the training suggested here is great, I feel great with this training, and I improved my times for the 100m to the 700m :) but not the 800m, I lost the ability to do some hard tempo, because we mainly did none, now checking my previous logs, I ran my 800m pb from slow reps not faster than 28 per 200m rep, while with this training we do insanely fast workouts yet is harder to reach the same level, the program is great., but for me it just need some more base and maybe more gym.
PS-Could you provide a link to those Renato files you mentioned.