The paper referenced in the article used zinc iodide, but specifically stated it would be compatible with zinc bromide and other electrolyte chemistries.

I think that suggests that if scalable and practical, the improvements potentially highlighted in this article could be applied to the flow through segment of the company you mentioned.

(Note, I’m not a chemist, so please correct me if I misunderstood anything- the article was linked in OP’s story, and I compared to the website you provided).