Brave is built on Chromium. So, by default, no they are not safe from this. Without extra effort, Brave will have this feature. I don’t know if its feasible but there’s a chance the Brave devs can remove the code from their distribution, but that’s the best case scenario and just puts them in the same position as Firefox: they get locked out because they refuse to implement the spec.
I have to imagine they will strip it because if they don’t, it’ll be dead to all of their users.