That's also much less than 19x what an EDLC can store. Picking a standard Maxwell part[1] I calculated 36 J/cm3, so it's more like 5x; still impressive, but comparing a lab result to a product isn't fair; there are EDLCs with much higher energy densities in the lab.

https://maxwell.com/wp-content/uploads/2022/07/3003348.2_3V-...