So basically his statement is incorrect, misleading, and completely worthless. EVERYTHING is subject to value fluctuations in an open market. I'd take a currency that doesn't lose value over one that does anyday... but that's irrelevant because that currency doesn't exist and never will.
-Incorrect: Literally, of course. But it isn't meant to be interpreted that way; I certainly can't speak for Atlas but I'm sure he is not saying a Bitcoin does not fluctuate in value.
-Misleading: Perhaps, we all interpret things differently. If someone fails to see the expression for what it is, it could be interpreted literally, meaning his message could be conveyed in a different way than it was intended. That's misleading. Sure.
-Completely worthless: Meh, if it's helped you understand the English language better, perhaps. Unfortunately I fear that is not the case.