This is subjective, but there is loss of real speech information here. I don't hear the accents of these speech samples daily. I can easily follow the uncompressed versions. But the heavily compressed versions delete cues and I could not initially understand them.
This is an effect even with regular telephony these days. A smartphone, carefully held a little way from your ear because you don't trust it to mask touch events when used as a phone, and using 16kbps audio, is not as understandable as an old fashioned hardline phone. Ironically, higher fidelity audio via app (e.g. Whatsapp phone calls) scores better, despite the occasional glitches.