People have often reported fat-finger mistakes that get reversed, like 10M shares at 0.002 - an 18K oops. The 0.0009 trades were in value high 6 figures. If the MMs reverse 5 figure trades for a fat finger mistake, why not reverse the 6 figure mistake?
Its not a reasonable explanation to say the MM who did this ate the cost of that trade if it was truly an honest mistake.