[DennisP]

It doesn't really have negative implications for MSRs in general. It's just one design out of many.

The debunked claim is just that they could get uranium fuel utilization comparable to a fast reactor, using a reactor operating mainly in the thermal spectrum. None of the other projects make that claim; either they actually are fast reactors (Moltex, Terrapower), they claim much lower fuel utilization (Terrestrial Energy), or they plan to run on thorium.