This feature is for people with knowledge about HDMI and Audio Video equipment.It’s a shame it’s not public because it’s pretty damn awesome.
Its not public because it's a technical diagnostic tool for pro installers. Similar to the service menu on a TV. Just giving someone a 41 page technical manual doesn't mean they will know how to fully utilize it. Still a nice feature for the tinkerer to have access to but manufactures aren't going to make it public because they probably then assume support responsibility and they don't want that for non CIs. Also not sure if changes done in this menu are automatically reset by a factory restore. Might be I just don't know.