You only need to unload the stabilizer if you've allowed the trim runaway to progress to a point at, or very near, the full nose-down limit AND you failed to reduce thrust and your airspeed is excessive. The Ethiopian flight's indicated airspeed reached 390 knots. Neither accident crew accomplished the steps on either the runaway stabilizer or unreliable airspeed checklists. Both of which have as either their 2nd (IAS) or 3rd (trim) step to disengage the autothrottles.
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