Ok so the article is very vague about what's actually done. But as I understand it the "understood content" is transmitted and the original data reconstructed from that.

If that's the case I'm highly skeptical about the "losslessness" or that the output is exactly the input.

But there are more things to consider like de-/compression speed and compatibility. I would guess it's pretty hard to reconstruct data with a different LLM or even a newer version of the same one, so you have to make sure you decompress your data some years later with a compatible LLM.

And when it comes to speed I doubt it's nearly as fast as using zlib (which is neither the fastest nor the best compressing...).

And all that for a high risk of bricked data.