I severed the wheel speed sensor wires to my front right wheel earlier this year and can confirm that the issues were similar. This is my guess as well. A simple code pull from the OBDII will tell him if that's the case down to the exact wheel.I can only speculate without being there.
Based ONLY on the images provided, if accurate, could be a wheel speed / wheel slip or brake sensor.
Probably hard to diagnose but pretty simple to fix. Wishing you well.
Keep us posted.
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