I've done some workouts from it. Its higher intensity 'base builder' imo

A lot of the z2 workouts are 70-75% which can be somewhat difficult. IDK about you but my z2 intensity for long days is 60-65%. What it's doing is squeezing more intensity out of less volume.(Trainer Road SSB is the same principal but at a higher intensirty)

Then there are other workouts that don't make sense to me like 8x3min @90% which is pretty easily accomplished if you ask me which supports my opinion that this is a base builder. I mean it makes sense being a winter plan.

Going further in the weeks it does start adding the more intense volume. It should be a good plan if you stick to it. But I feel those long 70-75% are going to tear you up with run volume. At least you dont need to worry about swimming though

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