American House with an EV, all electric, and no solar, I use about 1200 kWh/mo (1.2 MWh/mo) on average. This could only carry me through about 3y. Even if I had access to good public infrastructure I think best I could do is 6y (again, all-electric home).

But I digress. Lithium ion as purely load shifting is a pretty reasonable, I'd argue critical, solution for covering day/night loads, but starts to fall apart completely when it comes to seasonal (summer/winter) loads.

But what makes this plant interesting is the addition of super capacitors. The combo battery/SC plant is less about day/night load shifting and more about providing stability to a shifting grid. As supply and demand grow increasingly decoupled, and we try and shift away from expensive peaker plants always on standby, systems like this can dramatically help smooth grid performance.

~90 MW of peaker capacity is small potatoes currently, but this is a big step towards a more reliable grid future.

Supercapacitors are for stabilizing the grid, the batteries are for flattening the peaks/load-levelling at diurnal scale.

Batteries and capacitors both store electrical potential, but in different ways. So yes you can compare their performance at storing and then delivering electricity under specified conditions.

Batteries can keep charge longer with less loss, but capacitors are faster at responding to rapid changes in eletrical supply and demand.

The quote you included shows exactly how they compared the performance at low temperatures, as an example. Maybe I am missing your objection?

The caps also average charge fluctuating in the batteries, which should significantly enhance the cell lifespan.