The comment is factually correct, It's a inconvenient truth. Battery deployment is not free.Someone (the taxpayer) pays.

I suspect after they are quite widely deployed. Government could change conditions in future that they must be available as virtual power plant (VPP)

There has been a rush on these since people want access to cheaper power and they believe to avoid the power increases to come. That there will be big increases in power , especially during peak time is the forced introduction of smart meters which allow easy tariff change etc ....