Denied - it has not been 6 months and your appeal will be treated equally to all other players that have received a permanent ban.
You may appeal in 3 more months from now.
Here's the video from the victim's perspective:
He was in range to hear you say anything, so it has been proven you didn't actually say it in-game.
What will you do to make sure this never happens again?
Very well, unbanned.
If you wish to record a youtube video which includes playing music in-game, your best chance is to do it somewhere abandoned and let a staff team member know beforehand.