Sometimes problems are fixed, other times it's a good way to overclock. I, personally create a custom bios with the core and memory frequencies at overclocked yet stable settings. This way I get great performance without having to deal with software woes.
What he is saying is: instead of overclocking through Nvidia's drivers or Rivatuner he takes clock speeds he knows are safe and puts them in a modified BIOS for the video card. That way no matter what happens the video card will always run at those speeds.