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It is a molten salt reactor, just not a molten salt thorium reactor.

Sodium (without chlorine or similar) is a metal, not a salt.

They plan to use molten salt for energy storage, but the reactor itself is liquid metal cooled.

Ah, you're right. I think the linked article makes this quite unclear, but TerraPower's own website does a better job of it.

Sad for Meta it will be obsolete by the time it’s theoreticallyput online which I doubt will ever happen.