I have 93% after 45kkm (28 thousand miles) on my 40kWh Evalia, so I think 82% is really good. Here is the chart showing degradation numbers over time since I have purchased the car. Even though both 24kWh and 40kWh have forced air cooling of the battery, apparently the configuration of the ECU was not changed to account for higher heat generation in more power-dense 40kWh battery, so it is much less effective than in the 24kWh version. Unfortunately the ECU is located inside of the battery, so it is nearly impossible to change the parametrisation without opening the battery itself. This was one of the reasons why I decided to install battery extender from Muxsan. I did not want to void the warranty of my battery among other things. Consequence of this: my 7 seat Evalia is now officially a 4 seater due to higher weight of the vehicle.
Here is a chart showing the values SoH over the Odo (in km). Red dot shows the point where UBEx (Muxan Underbody Battery Extender) was installed.
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As for the discussion, I find that the "Nissan E-NV200 Electric van owners / enthusiasts" group on Facebook is quite a bit more active, there is an SoH thread started on 17th of December.