A hydrogen fuel cell is the highest energy density battery possible. It doesn't how more advanced li-ion or a variant of it gets, hydrogen fuel cells will still have a higher energy density.

Furthermore, by the time you're talking about metal-air batteries you are basically build a fuel cell but with metals. Which is to say you're just building fuel cells that are fundamentally inferior than something that already exist.

We have basically created an inverted worldview. In reality, the li-ion battery is fundamentally inferior to hydrogen fuel cells, and any attempt to advance EV technology will inevitably produce a hydrogen fuel cell powered car.