Yes the iStore is eligible for this QLD rebate as well as the Federal Government rebate.
From the govt website:-
https://www.qld.gov.au/housing/home-modifications-energy-savings/climate-smart-energy-savers/about
Solar hot water systems and heat pump hot water systems.
Solar hot water systems and heat pump hot water systems can receive a discount under the Federal Government’s Small-Scale Renewable Energy Scheme (SRES) scheme and still be eligible for a rebate.
NOTE - there is no Energy Star rating for any heat pump hot water systems in Australia and this is not a requirement for this scheme. The iStore qualifies by the fact it is included in the Federal Scheme.