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From their website, it seems work on the traveling wave concept wound down several years ago (not spelled out explicitly, but lack of updates).

I'd guess they figured out the traveling wave concept wasn't workable, and switched to another design.

As of last fall, they've partnered with someone in China to build a traveling wave reactor there.

The link clearly states that this is the MCFR - Molten Chloride Fast Reactor.

I think the confusion may lie in that people equate fast reactor with sodium. It's a fast MSR.

The submitted article seems to be mostly cribbed from the DoE's tweet; this link is much better.

dang or sctb, could you update the link to the energy.gov one?