just found this in an article on triathlete.com, a typical Couzens:
Interestingly, this is mirrored in the hugely polarized approach to training that we saw in this analysis from exercise physiologist and tri coach Alan Couzens when he looked at the final 90 days of Iden’s run training going into Ironman Florida at the end of last year. In short, the easy days are so very easy (and there’s a lot of them)—yet the hard days are exceptionally hard. (Note: the training theory we will talk about below involves a much higher proportion of zone 2 training.)
Yes, sure, but the problem is he just extracted time in pace zones from Strava. He ignored completely that Iden spent weeks at altitude and/or did heaps of uphill running. Partly on trails. And several long mountain hikes. All of this inflated zone 1 artifically. I’m not saying that Iden did not plenty of low intensity work but Couzens anaysis is pretty flawed. Still, because of his “reputation” it is cited as fact. He did the same for Blu’s cycling. Came to the same conclusion. However, he completely ignored all the coasting and descending. And this brick workouts where they do bike-run-bike-run-bike-run. The non-bike times were attributed to low intensity.
By the way, some people dared to question these analyses, guess what happend 
Therefore, any numbers coming from him should be taken with a grain of salt.