That's his point we've been unable to define it as any prospective definition is disputed. We keep raising the bar to ensure human primacy in it's measurement,

That's his point we've been unable to define it as any prospective definition is disputed. We keep raising the bar to ensure human primacy in it's measurement, obviously it's the case that many of these measures were not factoring in something important, intelligence is on a gradient line (as said by rf15) but many humans are not comfortable without humans sitting on the top of the gradient without a wide chasm between us humans and whatever else.