Good posts by the two posters above - JS and cbenson.
I also believe that copying the workouts from world-class runners, who are among the top 0.0001% of all humans in terms of genetics for running, is a recipe for disaster - and now it comes: even if you adjust the paces to your level!
Bekele has a VO2MAX in the mid 80s, if you can only run a 16 min 5k after some decent training chances are your VO2MAX is in the 60s, or maybe low 70s best.
He also has an incredibly efficient running form, strong calves, and even at very fast paces, like 64s, only produces a moderate amount of blood lactate.
That workout might work for him to get out the absolute last % of performance increase, but for a regular Joe running a 16 min 5k it seems totally overkill, and dangerous.
400s at 800m pace by itself is a very tough workout, unless you are just very bad at racing an 800 and therefore have a slow 800m pace in comparison to your 5k. Now doing 6 of them, is a LOT. Doing 6 of them, with 400m at 5k/10k pace before, is a whole other level.
If you have the ability to run a 14:40 5k, which you very well may have - you certainly don't need workouts like this to get there. Look at the training of the Ingebrigtsens for example, lots of moderate workouts at controlled paces (with lactate or HR), making sure they can keep training week after week after week, year after year after year. Worked quite well for them, I'd say.