Yeah that's probably an OLED TV. Those are supposed to be able to show "true black" when a LED is off (or it at least absorbs the light very well compared to other display technology). Those screens also has problems with burn-in though. I have a friend that bought an OLED TV and there were burn-in problems after just a few years. He knew they are sensitive but he thought it would last a little longer than that.
Yeah a CRT TV can't be blacker than when its off could it? And since there is this dark grey thingy behind the glass I imagine that the darkest possible colour would still be dark grey.
Whether a 0 IRE or a lower IRE would be darker is a different question.
Broken Palette Links / and another Palette Choice
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Re: Broken Palette Links / and another Palette Choice
The difference would be harder to perceive - in the US, at least - with a properly calibrated set (where setup is considered "black" and calibrated as such). In Japan, I'd imagine the difference would be a bit more noticeable, since there is no setup.