Without specifying how it was tested that's meaningless. For example I've read of a test where keyboard users were slower because they had to do a find/replace operation on a file manually, moving the cursor only with arrow keys. That's like saying using the mouse is slower after forcing mouse users to type text on a virtual keyboard.
I think in most scenarios both can be fast enough that the difference doesn't matter, provided there's proper support for both.
Supplying actual data is always useful.
Especially when it contradicts a common opinion ;)
Sometimes, articles that contradict a common opinion do so because they're simply dead wrong. This is one of those cases.
Did Apple do a study? Did it come to the conclusion that the mouse was faster? If so, why is it dead wrong?
(The study perhaps had a more narrow set of conclusions than presented in the article. Wouldn't surprise me.)
The key take-away was they spent a lot of money on a research project specifically about mouse vs. keyboard and found the precise opposite to be true! Surprising to say the least.
* Test subjects consistently report that keyboarding is faster than mousing. * The stopwatch consistently proves mousing is faster than keyboarding.