How might this path be followed - perhaps by an aircraft in attitude hold with the left wing slightly down?
Not possible.
Any autopilot mode which would fly anything resembling a straight track over that distance would have to be heading-hold (which would fly a curved track) or flying to/via some programmed waypoints.
The Georesonance stuff is nonsense and this would be immediately obvious to anybody who has got some scienzze edukatttionn. 10/10 for a good prank though.