Could certainly be, but then product assurance is totally horseshit, I think.
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99.9% chance that it is rubbing on something inside the fenders. He has 3 out of 4 tires worn EXACTLY the same way?? One real easy way to tell and find if its something other than rubbing is to mount the wheels back up and push the suspension all the way compressed and see if the tire spins.
if it was a defect in the rubber or making of the tire it would have a feathered apperance to the rubber not a perfect concave cut in the tire rubber.
It will affect all 4 tires if they've been rotated a few times. Throw it on an alignment rack and get some specs.
I think Toyo was having a recall on a model of their tires.