Happily, you are misunderstanding their filing. They do have working prototypes which meet the announced specs.

They also have a plan to push beyond the current (and very impressive) 900 Wh/L energy density.[1] It is those future-looking plans which may (or may not) require higher energy density materials on the anode and cathode.

[1] https://www.enovix.com/wp-content/uploads/2022/06/Ashok-Lahi...