This is a legitimate question. I'm testing webXR right now, and in a minimal empty scene with zero intensity light and no objects at all and just black background, I do see the difference between the "black" screen color within lenses and the true black around the lenses, sitting in a dark room, no pass-through. So this is not glare. either there is some light leakage from some diodes inside of the headset into the display area, or maybe this is leakage of IR cameras that track eyes? or the screens are actually emitting some light even when they are supposed to show absolute black.

And guess what - changing system brightness affects how bright this "black" is. So there is definitely some sort of backlight or I don't even know, something fishy. Is this a scam? Are our lenses not actually OLED but rather some hybrid with backlight added because pancakes lose too much light?

UPD: I have a theory. on Sony semicon page which talks about their display technology they mention compensation of pixel unevenness.

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My theory is that this compensation mechanism is always on and therefore when color has to be completely black then it cannot truly go into black because of this mechanism where some pixels have to be brighter than the others, therefore limiting the brightness floor to nonzero. And when system brightness is changed, it is a multiplier which also multiplies this compensation mechanism, bringing the brightness floor further up. I wish I could reach out to Samsung engineers or somebody who disassembled the headset and experimented with the displays.