I just looked up the data from the reputable source - Idaho Lab who does test all types of Hybrids and EV in their multi-million dollar Lab with cars under test in the field being equipped with data loggers.
In brief: Capacity loss in Leafs ~38% after 24000 miles:
Fast Chargers (DCFC) degrade battery faster and impacts capacity (results after 63000 miles):
How did you come up with that number?
The reduction in Ah capacity over 17,258 miles (27,774 km) was 27.7% in this 2013 Leaf.
Still seems high to me, but there is no temperature data so is this a study of battery degradation in the worst case scenario? Is there any link you can provide on the context of the study?
It seems to me this Leaf would have lost one bar rather early.