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Sounds like the PPI on the screens is quite high, Apple calls it MicroOLED and without giving the actual PPI number they said its 64 times more than an iPhone display.
If I assume they mean a basic iPhone 13, then the ppi on that is 460, making the vision pro headset 30 thousand ppi
That's a huge upgrade over existing headsets
Quest 2: 730 ppi
Valve index: 600 ppi
PSVR2: 800 ppi
HP Reverb G2: 1050 ppi
Apple Vision Pro: 29440 ppi
PPI is in a single dimension, but the 64x claim is area. That would make it 8 (square root of 64) times the PPI of whatever iPhone they're comparing it with.
It's not really a relevant metric for VR anyway. Number of pixels and field of view determine the 'resolution' of what you end up looking at.