Overclocking has always worked like that. That's why people turn up their fans to go for maximum clocks. This is nothing new.
Totally agree with you, but I think what he is referring to is that GPU BOOST seems to be directly correlated to temps, and that 70 degrees seems like the limit for the auto OC to kick in. So... maybe if you ramp up the fan, keeping temps under 70 degrees GPU BOOST would be able to reach a higher multi... just as if you were manually overclocking.