I agree with the sentiment. But I don't agree with the change, because they're hiding the rampant sexism actually present in the original text of the Bible.
Replacing "demon of dumbness" (exact quotation?) with "speechless[ness]" also obscures the superstition that governed that society's understanding of the the causes of illnesses and afflictions.
Mute? Demon possession!
Blind? Demon possession!
Children fell ill and died? Demon attack!