I agree with that, although I think it boils down to the fact that even if human intelligence is general there is still no limit (other than the laws of physics) to how much more technologically advanced another species could be. If we believe that human intelligence is general, then we could still increase our speed and abilities with technology—we already do this with things like a pen and paper, computers, cultural ideas about collaboration, etc. I certainly think it's possible that human intelligence is general but that our total computational and creative power is so incredibly tiny compared to another species with general intelligence that the other species may not care much about our wellbeing.