No worries. Data compression does not concern itself with dynamic range. It concerns itself with file size and attempts to preserve the fidelity as much as possible. In the case of lossless compression, full fidelity is preserved. Most of the lossless approaches use some sort of entropy coding. One of the best known ones is Huffman. A more advanced one is Arithmetic. All of these methods look at data statistics to compress BITS. I'm fairly familiar with data compression.
I'm not as familiar with audio dynamic range compression, but my understanding is that it applies a gain mapping where the instantaneous gain is mapped to a different gain using a linear (or quasi-linear) function. My yamaha receiver calls this silent cinema I think. This does not necessarily translate into a smaller file. We are talking dynamic range compression vs. file size compression.
Awesome thanks for that. I think that was the gist of the ars article.