Tesla Model 3 LR AWD, Renault ZOE R135 ZE50 GTLine (Sold: R90 ZE40 i Dynamic Nav)
Interesting find. I've not seen it before. And, as you say, the chart shows popular times, just like Google Maps for stores etc.Have a look at the MOOVILITY app / website.
Each charger (or at least most of the ones with live data) has a chart showing a busyness "prognosis".