This is so far off the mark that it is comical. Jack Daniels was not Ryun's coach, Bob Timmons was. Jack was a friend of Timmons. Timmons had originally been a swim coach, who had trained swimmers with a ton of interval work (which you can do with swimmers, but not with most runners). Ryun's training in his best years was probably more heavy on short interval work than Duane Solomon's.
Daniels also was primarily an exercise physiologist who did physiological testing on a lot of the elite distance runners of that era, and formulated his coaching philosophy based on his exercise physiology data. As a coach, he led SUNY Cortland runners to eight NCAA Division III National Championships, 31 individual national titles, and more than 130 All-America awards, so he must have known a bit about coaching.
To quote Wikipedia about Daniels' coaching philosophy,
Daniels divides running performance into six components. Daniels argues that each of these components requires a specific training intensity to improve.
The Cardiovascular System, specifically the body's ability to transport oxygen.
The Running muscles' ability to use oxygen.
The Lactate threshold - the ability to cope with, and minimize, lactate in the blood.
The VO2max - the maximum oxygen uptake capacity.
Speed, for example, leg turnover.
The Running economy - the efficiency of the runner's movements.
Daniels uses five specific training intensities to improve the different
components above. A runner can determine the correct speed for each
intensity based on the VDOT from a recent performance.
Daniels was one of the pioneers of using exercise physiology to generate specific coaching strategies for runners. There certainly have been refinements of the concepts he started, but many of them have been built on the foundation he laid.