UPDATE:
We talked with Zach Clements at the University of Texas Radio Navigation Laboratory about this.
When he looked at the reports on ADS-B Exchange for one of planes that had been reported being spoofed into square patterns, he found they plotted out in a circle.
Very likely the reason they look like squares when viewed at PlaneFinder.net has to do with that site’s GUI (graphic user interface).
Zach and the Univ of Texas Radionav Lab are always insightful and helpful. Thanks again, Zach!
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