avtr_83cdc441-70d1-4f1b-809f-af667bd25067 has avatar audio that plays when you toggle on Expressions -> Emotes -> Emote.
This audio bypasses safety settings and will play even if avatar audio is disabled for all ranks and avatar visibility is set to "shield"/to use safety settings. It also bypasses earmuffs when they are set to affect avatar audio.
Looking at the debug view it looks like Emote parameter that is activated is in the Base layer.
Testing this with two clients running on the same PC was difficult for some reason as avatar audio sometimes refused to play. I replicated this with a friend.
See this video for demonstration:
Reproduction:
  1. Make sure avatar audio volume is above 0
  2. Disable avatar audio for all ranks in safety settings
  3. To avoid issues, have another person join to lobby and use avatar avtr_83cdc441-70d1-4f1b-809f-af667bd25067
  4. Make sure to select and choose shield for avatar visiblity instead of fully showing them
  5. Toggle on Expressions -> Emotes -> Emote on the second player
  6. You will hear avatar audio
Affects both live and open beta.