Sorry Branch, but I know very well your video,
and this one is completely different!
In this we have 3 ships almost touching the UA.
We already know that some sounds are audible just coming close to the UA and pointing to it, like the BG VID 8 noise sound, and the purrs, but they become all audible when close.
In the second video here
https://www.dropbox.com/sh/6qsf525u5....03.17.DVR.mp4
we have a Sleipnir like behaviour with even less purrs (ONE!). Just do a test with a wing of four, and all ships very close to the UA, and then we can talk
And to the CMDR that suggested 12 ships close to the UA, I totally agree. But first 4, it's a lot easier...
In the Sleipnir video there were at least 5 ships, yes, but not all were really close to the UA.
It should be the first thing to try immediately, in my opinion, as it is one of the few concrete discoveries we had among thousands of speculations...