Well, it kind of is a confusing term. We still need an APU or a GPU. These brushless motors are just high tech starter/generators. Just that a typical engine of this size is air started. The Lear 60 has the same series engines, and the same starters. And with out a gpu, we kind of mutter a small prayer before we try to start.
With all the high tech glass cockpits, we still need aux. power to do any kind of setup. And, a GPU or APU still aids in a cooler start.