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No, its not a subset of fusion problems. Very different problems:

Molten salt fission problem = dealing with vast quantities of a highly chemically active salt touching our plumbing directly over 40 to 60 years.

Fusion problem = containment of a small quantity by a magnetic field.

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Fusion also has the "dealing with vast quantities of a highly chemically active salt touching our plumbing directly over 40 to 60 years." Nobody talks about it because the magnetic containment problem is harder.

You can't use water like most fission designs?

Some fusion designs in theory would burn deuterium-tritium. Typical way to produce tritium is from lithium. When lithium absorbs a neutron it fissions into tritium + helium. Potential designs for fusion reactors then have a way of exposing lithium to the neutron flux from the reactor.

These smaller modules would be ideal for that. As the plumbing wears out, replace the module, and recycle the old module, make another one.

Smooths the scaling, production process outlays, gives opportunity for continuous improvement in the module manufacture and efficiency

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