They are at higher levels. You forgot wrist-locks.
Wristlocks are legal in BJJ unless you are in the children's division
At white-belt? I was told otherwise by a purple-belt where I used to roll.
However, the blue/purple belt rules are typically extended to white belt divisions. Wrist locks are legal there.
Perhaps he meant it as a suggestion or house rule then. I was told that wrist-locks, when applied by the unskillful, are dangerous because they have to be applied quickly making tapping someone safely with it nuanced in practice. I thought it was too bad, since I know a few wrist-locks from the JJJ I did when I was a kid.
Yes. I also used to train at a place that didn't let white belts do wristlocks. It's an in-house rule some places have. But in IBJJF competitions adult white belts can do them.
Nice. I'll remember that when I compete and can't finish an omoplata in the usual fashion.