Not sure what benchmarks they are using, but the one I use “GeekBench” shows that the MacBook 13” beats the Surface Book, and the MacBook Pro 15” smokes it by 2X. (And these are “older” (June 2012 release for the Pro) Apple products, due for a CPU update soon).
Surface Book: http://browser.primatelabs.com/geekbench3/search?dir=desc&q=surface+book&sort=multicore_score
MacBook 13”: http://browser.primatelabs.com/geekbench3/search?dir=desc&q=macbook+13%22&sort=multicore_score
MacBook Pro: http://browser.primatelabs.com/geekbench3/search?dir=desc&q=macbook+pro&sort=multicore_score
Perhaps they meant the “MacBook Air 13””? If so, the Surface Book barely beats it: http://browser.primatelabs.com/geekbench3/search?dir=desc&q=macbook+air&sort=multicore_score
And this is with a fresh install of Windows...in my experience after 2-3 years of use the Windows boxes will slow down substantially due to “creeping crud”.
While that's true to a degree in nearly any consumer desktop OS, it is especially true of Windows because of its accumulation of crap that it can't get rid of, particularly in the Windows Registry and other hashed databases.
And while it's bad after 2-3 years (e.g. drops to half-speed generally and quarter-speed for some operations), I've seen some Windows systems slow down by that much in less than a year (depending on what they're used for), which is inexcusable.
But it's only fair to say that -any- fresh consumer system is going to operate at rated speed, and after that it's all downhill. :-)
The only operating systems I'm familiar with that retain their original speed indefinitely are Unix and Linux servers.
Your links are outdated and this is about a new as yet unreleased Microsoft product, the New Microsoft Surface Book.