Simon Hackett on the Sun Cable Project, page-7

Correct, Redflow hasn't communicated that it is pursuing grid storage or stabilising applications.
Redflow ZBM2 would likely need to be certified with IEC 62932 and UL2054, which we haven't seen mentioned from Redflow yet.

The SunCable has a long timetable.
https://www.pv-magazine-australia.com/2019/06/26/pre-assembled-concept-proposed-for-10-gw-northern-territory-pv-project/
Financing not expected to be finalised until 2023 and construction not expected to be complete till 2027.
Though according to the above article the Australian company building SunCable solar array will be
https://5b.com.au/

Ambitious plans have been announced for a 15,000 hectare solar array near Tennant Creek in the Northern Territory. If built, the 10 GW solar farm will join the ranks of the world’s biggest solar parks and be coupled with a massive battery of an unspecified capacity [with unspecified chemistry].