UP In Arms, page-77

Interesting list. Two are retailers, one or maybe two are at laboratory test bench stage. The smallest of the 2 or 3 batteries in production came in at around 2 tonnes, 60% round trip, but that does not include Redflow who are in the list.

Wisonsin USA is get a double entry, one for a university test bench product the other for the 2 tonne battery, but then CoverTel Power, a reseller from Melbourne, gets two mentions. Must be a weird report.

There was a Chinese business who made a flow battery, not a lot of easy to find detail other than from 2014 on this page,

Some issues are probably rather similar from 2014;
Some challenges still remain for Zbest Power Co. Ltd to overcome, including the traditionally conservative attitude of utilities towards new technologies and the time required for the regulatory framework to adapt to energy storage.

ZBest Power, was sold to Shenzhen Rainbow Fine Chemical Industry Co. LTD, they seem to specialize in aerosols, especially paints, I couldn't easily find a mention of batteries of any type from them.

Not sure where that puts your comment;
But global media reports in recent years suggest that other companies may have better Zinc reflow battery tech.
Which you support with;
Don't remember the name of the last company as it popped up in my feed a few months ago but it was chinese and it had a hardware solution to dendrites.

Do you have another source that supports what you claim?