No they actually mean power. Supercapacitors can energy faster than lithium batteries can(more power). While batteries have power densities hundreds of watts per kilogram, supercapacitors can release thousands of watts per kilogram. Now if we ignore the bullshit with carbon fiber supercapacitors it sounds like what lambroghini really wants is an energy storage system with more energy density and power density than we have today.

Integrating something with a high power density into a vehicle frame might not be such a good idea. If we really do get capacitor level power densities, then the stored energy in the frame could be released really fast during a crash. If the stored energy is enough and released fast enough we essentially have a bomb. There is even the potential for the energy release to cause a relatively localized EMP.