No, it's the new White Knight using refurbished core.
The older white knight has similar maneuverability but has better defense and weaponry output.
EDIT: They DO have extreme punching power (able to blow a 20 m crater in the ground) but of course he had limited ammo. On the other hand, it's best used as distraction and indeed, mass bombardment for hit-and-run attack (at lower altitude where I.S. speed are greatly restricted, missile still able to chase them)
@ Eras
Maybe you has a penchant as story editor. You knew how to write a fic, and what kind of fic is good material, yet unable to put your own idea when you want to