That isn't aurora, its under them.
Yep, I think we're agreed on that.
And the exposure is 8s at F2.8 at 12800 ISO with a 10.5mm fish eye. Which will screw with things somewhat.
As reference ('cos I'm not up to speed on this) when I used to dabble in astrophotography a 30s/1 min exposure on a standard 56mm lens at ISO 400 would give decent picture of aurora without any obvious start trails. Don't know how the bloggers numbers fit in with that, I'll leave it to the experts.
(are you smelling "Photoshop"??....closest thing I've seen to lights on the ground like that is the Dutch greenhouses you see coming towards Lambourne from the east at O dark thirty AM in the winter....Cynic? Me???)