I suspect that many CVT failures are caused by failure to change the fluid regularly. The schedule for your Nissan shows 30k miles intervals which is common.
So how many miles and how often if ever has the fluid been changed?
Of course many people never have this done and when the CVT flys south permanently they start looking for a scapegoat to place the blame on; meaning Nissan.
I’m not saying that YOU are guilty of this; only that it’s a common character trait.