Follow the link in the Update part. Kotaku link by the way in case that bothers you, but it's a PDF straight from the source.
Could just be they either forgot to list it and/or didn't care to make the software to play back the audio, as supporting a relatively minor feature (audio playback when you'd only want to rip these days) may not be seen as worth developing software for versus supporting PS1 games that you'd need an emulator for if you intended to sell digitally at all.
Although given that an audio player could probably really easily include CD support and ripping (and they'd want a player just to verify the MP3s you have on system for custom soundtracks, unless THAT'S not happening either), so it probably doesn't bode well period. Really disappointing given that Sony was a front runner on BC, and rather than stay good about it even when it's spotty software it may be moving to "if we can charge them do it." :/