Sorry but that is just marketing rubbish. I've read plenty of articles on jitter and how it is supposed to affect audio, but data transmission does not work that way. All devices, whether it is a PC, tablet, mobile phone, DAC or AVR, all use buffering. An audio data stream is not constant, whether it occurs over a network or internally within a device. Network audio streams in particular have to contend with other data streams over the local network, so the audio arrives at the intended device in packets, or in bursts. Those data packets are buffered in memory and the device then uses the data as required. As long as the memory buffer is not emptied, the device can consume the audio stream at a constant rate, so there is no jitter. Audio streams have a low bit rate compared to what a network can handle so drop outs do not occur unless there is problem with the source.
You are correct in that an Eversolo with an SSD card will never experience drop outs because the data is consumed internally but buffer under-runs on a local network are rare enough to be ignored. My Pi3B handles high-res streams from my Roon server over WiFi without any issues and that's with my son gaming and my wife watching Netflix at the same time.
