I haven't watched them. There is a lot of nonsense on youtube.Youtube is full of tinnitus relief videos, but I suppose they are all click-bait nonsense?
Fortunately I don't suffer from tinnitus myself (I am not a musician nor have I listened to very loud music much in my life), but if I did, I would try all the tricks on Youtube. I mean the tricks such as snapping fingers against the back of your head etc. seem pretty harmless so why not try?
Thwacking myself in the head sounds like being punked. Not going there.
When you're younger, tinnitus can be temporary (such as after a loud concert). While such exposure can gradually create louder tinnitus, it doesn't happen all at once, overnight, in one ear, as the Meniere's did.
The first ENT I saw, literally gave up on me. That was a real thrill.
I then sought out the best ENT in my area (recommended by my primary doctor), who diagnosed me, and provided the script for meclizine.
I generally don't dispute the diagnosis of my doctors against youtube videos.