My point was that the progress towards renewable/low-carbon energy is nowhere near finished yet. Something like an order of magnitude more renewable generation than what we currently have, still needs to be built if we want to truly replace fossil fuels.
It's a counterpoint to the claim that the transformation has already been achieved.
I think the claim was that the technology to enable the transformation has largely been achieved, not that it's been installed. But you're right, there's a great deal more the experience curves we're going to be able to go down, so the costs of renewables and storage should fall even more.
It's a counterpoint to the claim that the transformation has already been achieved.