According to Stereogum reader Ryan, it’s an ‘official’ remix.
Muse fansite released this remix probably to promote the release of Muse’s 2nd uk single “Starlight”. An alias “Mr. X” has been taunting the website for the past few months. After much speculation many believe it to to be Matt Bellamy. He even goes to great lengths to encode the files with anagrams that decoded into encrypted passwords.
Interesting. I like the album version better.