Data for source-outputs is not helpful for showing information about PulseAudio sinks
I suggest you check PulseAudio sink devices for audio playback
pacmd list-sinks
Previous data for sink-inputs showed audio was not muted in PulseAudio
PulseAudio log data only shows 4 occurrences of ‘Mute’:
Line 435 & 487 – I: [pulseaudio] alsa-sink.c: Using hardware mute control.
Line 630 & 631 – I: [pulseaudio] module-stream-restore.c: Storing volume/mute for stream sink-input-by-application-name:Firefox.
The only place audio appears to have been muted is in the hardware device and not PulseAudio
I suggest you check if USB device has any software controls in ALSA to mute/unmute audio
amixer --card=2
But if this USB device only has hardware controls there might not be any software controls in ALSA
Line 516 shows that module-role-cork is still being loaded, so I suspect that may be still be a problem with the sink being corked rather than muted
Check PulseAudio modules currently loaded with this command
pactl list modules short