I agree completely. Rubbish.
Just as there isn't really a head or chest voice, of course there's not a nose voice. Perhaps what the person was trying to talk about is the pharyngeal resonance that some singers use in their mixed voice (which, in my opinion doesn't exist either... it's all about how the cords and other production bits are configured and many different configurations have been called mix or head or chest in the past.)
Often, when using what people call mixed voice (basically thyroid tilt to hide the breaks) singers will add in what feels like a pharyngeal resonance, but actually comes from the epiglottis. This can make the voice feel as though it's reedy and nasal, but unless the soft palate is open, that won't be the case.
It sounds like someone who doesn't know a great deal about the voice was trying to describe 'mix' or thyroid tilt with epiglottic constriction - however, as the vocal folds don't undergo any change other than the slight thinning brought about by the thyroid tilt, I'm not sure we can call it a 'voice'. It's a configuration and if you removed the epiglottic bit, people might suddenly want to call it head voice or chest voice (depending on the depth of cord closure at the time).
It might not be as complex as that, mind you, perhaps this person just really thinks there is a nose voice...
Cor, people don't half make up some drivel eh?!