You know, having re-read it didn't really occur to me that the threshold session was being done fasted as well...
It's not.
The point being made is that the z2 ride being done fasted is depleting glycogen stores enough to mean the actual 'work' (SS/threshold) isn't possible.
@TTM started
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You know, having re-read it didn't really occur to me that the threshold session was being done fasted as well...