So they're floating Battery Jump Starter Ships to help prime the Fusion Reactors? Basically, they're Starfleet's version of AAA when a massive Saucer Section goes down.
That could very much be true, needing to fix the Fusion Reactors before it can lift itself off the planet under it's own power via Anti-Grav
One thing I like about this video is the scale. The saucer looks HUGE and gives you a sense of what it would be like to see the E-D in person.