If it wasn't why is it called Vision Pro? It's the pro model, and there's mentions of other Vision headsets in visionOS. They started with the Pro model first to make the best headset they possibly can, then work on a easy to manufacture much cheaper consumer model afterwards
Also do you not know what "paper launch" means? With it's high price and low availability according to the rumors, that means it launches on paper, hence the term "paper launch." An example being the Nvidia RTX 30 series cards, as when those released no one could buy them as they were all out of stock, so they launched on paper. It's clear this headset is a pain to make so they're making limited quantities, then with the knowledge they gained from Mira Labs, make the mass produced Apple Vision which would have greater numbers than the Vision Pro.
You think “Pro” actually means more than “expensive” to Apple? Funny.