You didn’t read far enough in “How to submit a test.”
https://forum.audacityteam.org/t/how-to-send-a-test-to-acx/49588/1
The second posting has actual graphic captures of their room tone requirements. This is a picture, so the links don’t work.
Everybody gets Room Tone wrong. That’s the Room (or microphone system) performing, not you breathing, gasping, coughing, shuffling, smoothing, rearranging and clearing your throat. You can’t get up and walk away because that will affect the room acoustic signature and, among other things, screw up noise reduction.
Isn’t this fun?
Sometimes we can tell exactly what the poster is doing by the acoustic trash they’re leaving.
“OK, this is where they scooched their chair in a little.”
“This is where they yawned.”
“This is them nervously tapping their wooden table.”
“This is where they started texting their cousin in Cincinnati.”
Koz