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As mentioned in the article, the fluid can be recharged inside the vehicle, the pumping is just an option to speed it up.

> they are paid twice as used fluid must also be stored, transported, and processed

Isn’t this true of the discharged electrolyte in conventional batteries?

In theory you could transport the fluid like gasoline so you could charge it in some central facility the equivalent of a refinery, but then you'd need it to be transported both there and back.

The better solution is presumably to charge the used fluid directly at the fueling station using a grid connection, though that does have some issues. What happens if the used fluid out of some random car is contaminated with something?

Flow batteries are probably only interesting for grid scale stationary storage.

This tech is in its infancy

No guarantees that it will mature into something competitive in automotive industry though.