Mac the Mechanic
Another interesting quote, which indicates to me that the site was put together in a big hurry without proofreading by someone with a technical background:
On the ground, the 787 can be started without any ground power: The APU battery starts the APU generators, which start the APU to power the engine generators, which then start the engines.
There an excusable confusion between a generator and a motor-generator or starter-generator, but the idea of starting rather than powering a device "which then...." implies that it is running before the associated APU or engine starts to turn over.
I also believe that only one of the two APU generators at a time is involved in the APU start.
Details may not matter in publicity, but they matter when discussing the engineering.