Marc Elias says it can't be a settlement call because he would have to be on it, and as someone who is actually involved in the case, that is pretty strong evidence that requires more than a random youtube video by someone who I know absolutely nothing about.
Also, by the way, from the actual call, it appears that Trump is committing a crime on the call, by attempting to get a government official to break the law. (There is an active investigation in Georgia on this matter, I believe). I believe that doing so violates any claims to attorney-client privilege, which would remove any illegality from leaking this call even were it a settlement call (which I do not concede that it is).