Maybe it's just a typo that AJ hasn't corrected, yet?
2-1 lossless compression is pretty much the industry standard for ROM (Roland have used it for years). Having it available for your OWN RAM sounds is novel, though. Any speed up of data loading is good, even though it doesn't improve the 64MB limit for RAM.
Next person that gets a hold of an Audya at a demo (or buys one), I'd be VERY interested to hear how long it takes to load that 64MB into RAM. If it is the order of just a few seconds (and the reports that the Audya does continue playing and working while it loads are correct - these days, I'm unfortunately unable to really trust what these guys ever say) that is still a VERY significant improvement, and might finally make serious sampler use in a typical arranger scenario a reality.
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An arranger is just a tool. What matters is what you build with it..!