Don't worry - no tricks here. Theory is stable and live. A simple explanation of the paradox is: SoundSlimmer works with audio data only utilizing certain specifics of digital sound signals to losslessly slim the audio content.
SoundSlimmer can be decoded back and resulted file will be bit to bit identical to the original file. Much of a same way WinZip or WinRar compresses standard data, but only with 10 times more compression power as it related to the music files!
Current version of SoundSlimmer losslessly compresses Mp3 and Mp3Pro files averaging 20% less file size, while general purpose archivers are capable to reduce file to 1-2%.
The core of the SoundSlimmer is a semantic approach to the data that represented music and correlation analysis of spectral data patterns called sound genes.

Vast variety of Web data acceleration technology have propagated the market, yet all of them failed to accelerate or proper to say, compress media data, especially when it comes to the Internet Audio.  
Another innovative product (see SX Fidelity amplifier) that is based on proprietary "Sound Genome" technology developed by Sound Genetics, has broken axiom of the conventional compression theory which stated that previously compressed files can not be compressed further.