Fuses and OTP are a very common thing to throw in to systems. Most microcontrollers offer capabilities like this, and now they're drifting into more general purpose, larger SOCs. Maybe you use it to keep a serial number, or to separate product families, or for something like this.

Tegra's main purpose of the fuses is to handle holding cryptographic keys, boot parameters, and to disable the debug port. But since they have a fuse unit already, they provide a few words for the end-user to use as they please.

I too am curious what "non-retail" means in this context.