I've looked at the beatsbydre.com website and looked at the different headphones. The only pair of headphones where they talk about sound as intended are the Studio ones, and it's clear that they're talking about Dr. Dre and his music specifically, not artists in general.
Could you link to a page where they claim what you say they do?
Sure.
After 25 years, Dr. Dre was tired of spending months on a track only to have his fans hear it on weak, distorting earbuds. Two years and hundreds of prototypes later, Beats Studio headphones are the icons that bring you sound the way it was originally intended.
http://beatsbydre.com/headphones/beats-studio/beats-studio,default,pd.html
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I'd also like to emphasize and point out this part:
"...Two years and hundreds of prototypes later..."
The Beats must be good.