By using the same logic, no innovation has been made in grappling ever, since most of the stuff we do today has been around for long, in a way or another.
Mendes and their berimbolo and everything finishing in a leg drag position? Some dude was doing that in the 90ies.
But if you follow the sport you know that the last ADCC or IBJJF Worlds looked like a different sport compared to the older events.
The devil is in the detail, just because someone was doing inside heel hooks or inverting from de la riva doesn't mean the techniques have not been refined a ton, and are still being refined today.
Now, you may hate Danaher, but you can't negate that he is doing something right.