I’m not at all a fan of the ketamine clown, but it’s literally just a dumb pipe.
If you’re truly concerned about the integrity of data passed over it, treat it as one of many multiplexed channels, and use out-of-band cryptographic validation, which any serious voting system design should include regardless.
The starlink thing is just a backup link for communicating election-night preliminary count data counted by election staff at the booths. Then the ballots are transported to counting centres for the official count. Full legal results aren't known for a couple of weeks.
In the article, the AEC says Starlink is only a backup.
Also, there's a lot of remote polling locations where the only options are satellite-based - so if they're planning to use the NBN satellites (Sky Muster), but a backup is required, Starlink makes sense for that.