Yes. But they're not cheap and the production process is quite involved. And he specifically drew a relation between material used and possible aerodynamics:
[...]Replacing metals with ultralight, ultrastrong materials like carbon-fiber composites can provide safer, lighter and more aerodynamic vehicles that consume severalfold less energy and could be simpler to produce with 80% less capital.[...]
From:"Reinventing Fire: Three Energy Gamechangers for China and the World, Nov. 15th, 2013, pg. 2
He specifically mentioned "more aerodynamic" in addition to "lighter". I'm also not that convinced of "ultrastrong" materials being safer due to the fact that you want a crumple zone to soak up kinetic energy.
Not to mention that "severalfold less energy" is a lie: The BMW i3 already largely consists of carbon-fiber and is not that much lighter and, if you calculate the average energy consumption, doesn't consume that much less energy.
Lastly, carbon-fiber is not more "simpler to produce". Folding, bending and melting metals is easy compared to what you have to go through for carbon-fiber. Not to mention that it's not recycleable. Metal is easy to recycle.