If you find a 10% genetic change in a non genetic sequence between modern penguins and ancient penguins and you think it corresponds to 20,000 years; but find that instead it corresponds to 40,000 or 60,000 years - that means that the rate of change of that sequence is SLOWER than expected, not faster.
Somewhere between the actual science and this school publication someone got a little mixed up.
And even a doubling or tripling of the expected rate of accumulation of neutral mutations doesn't come close to the speed of evolution and speciation that Creationists would need for every species on Earth to have descended from those that could fit on a boat within the last few thousand years or so.
“I don't believe in evolution, except when it happens thousands of times faster than any evolutionary biologist ever suggested.” the ignorant Creationist maintains.
I think what is going on is they are talking about the evolution of the penguin BEFORE the DNA samples were ‘alive’. If you push back their ages then you compress the evolution that got them to that state.