Obviously, until you have enough renewable generating capacity to charge your storage, you are not selling stored energy: you sold what you generated.
It is extremely disingenuous, not to say dishonest, to make up scenarios based on status quo when there is still very little renewable generation capacity.
I find equally disingenuous and dishonest to talk about pumped storage for renewables when they do not exist as a viable economical model.
If you want to blame the lack of renewable generation capacity then feel free to do so. Pumped storage could in theory, in the future, when the time is right, be cost effective. We don't know. We are not there yet. Its a financial model to be to be tested when and if we get there.
For now the financial model for existing pumped storage do not care about the purchasing price or selling price, or what kind of power it is being charged with.
It is extremely disingenuous, not to say dishonest, to make up scenarios based on status quo when there is still very little renewable generation capacity.