I can confirm that the XA5400ES outputs DSD from an SACD. CD playback is NOT DSD but PCM at the standard 44.1 kHz sampling rate.
How do I know that? I’m using the HDMI output of my XA5400ES, connected to the HDMI 4 input on a Bryston BDA-3. (The BDA-3 has four HDMI inputs. Only input 4 is HDCD 2.2 compliant and I found that it was the port I needed to use.j
The BDA-3 uses LEDs on the faceplate to identify the sample rate of the incoming signal and to identify an incoming DSD signal, if that’s what the source device is sending it.
With CD playback, the 44.1 kHz LED lights but the DSD LED doesn’t.