Have you read those articles? GPU is overclocked NOT ONLY for benchmarks but for some selected apps too. For example, camera app is executed in the same mode. This looks like a primitive implementation of turbo mode where overclocking is based on app type rather than on thermal conditions. Obviously Phil is too dumb to understand this.
Well lets not jump to conclusions on what he means / thinks based on a 1-word tweet.
That said, I agree, the phone appears to be adapting in a way similar to Intel (and other companies) go into Turbo Boost under special conditions. It is quite possible that the thermal condition trigger is patented, or otherwise protected, meaning Samsung had to go an other route for their processors.
I also agree with many previous posts, the fact that the phone was able to reach those speeds, means, it is a valid test, regardless of the trigger for the speed bump.
As far as the iPhone is concerned, I am sure it is only a matter of time before those devices have more adaptive processor speeds, or cores than they currently do. Likely utilizing technology of Samsung, or other chip manufacturers.