Years ago I heard this exact sound clip,
nothing else just this part you've shared in the video but played in reverse.
"Backmasking"
One of those old records that people use to say had a secret message in it when played backwards. This song and that clip have always haunted me since. I don't even play this song anymore because I feel superstitious, it's the only one among many I listened to played backwards that disturbed me enough to stick in my brain.

https://youtu.be/DgtxpRNT-r0