URL opens to "https://www.ou.edu/deptcomm/dodjcc/grou ... /curve.JPG
Strangely enough, "https://www.ou.edu/deptcomm/dodjcc/groups/99A2
" opens to a page about the DoD and anthrax vaccination.
Regardless, the graph doesn't apply to BEVs or plug-ins in general. If we go with the graph parameters, that means those buying hybrids today are "early adopters" yet they are instead "laggards" at best.
The innovator part also makes no sense. Those would be the scientists, engineers, and leadership who bring those vehicles to market, not the consumers who buy them.
If this has anything to do with vehicle new tech adoption, best explanation might be that someone learned what a standard deviation was for the first time, maybe was drinking a bit too much, had a (mis)revelation, and came up with this chart.
'19 Model 3 SR+, '19 Leaf SV, '12 Plug-in Prius (sold 3/19), '16 Leaf SV (prior lease), 11.43kW Solar PV (16MWh/yr prod.), 20.5 SEER/13.0 HSPF ducted air-source HP, 3.70 UEF HPWH, Induction Cooktop, Variable Speed Pool Pump, Battery powered yard tools