Just to confirm, have you already checked archive live streams: https://goo.gl/J7m54z ? Generally, once the videos are deleted, you can't recover them through YouTube, unless you have a backup to access them again!
it is not a live stream. it’s an upload. as well, i have looked for a solution and found that A LOT of people have done the same thing i did: tried to remove a video from a playlist, but instead it removes the video entirely. i think this layout should be changed for sure.