Hmm, am I missing errata? 9 and 10 on mine is "Assault" for the ASF table.
Which I suppose could translate to Small craft.
Or they could be using the `Mech definition of tonnage for aerospace fighters, rather than the old 3 class system.
Though if they are, I suppose it still means you would need an 11. 12 still seems a bit superfluous :)