In fairness, I have seen that argument made both ways but it is a certainty that the renewables brigade never do any sums. For instance, I once estimated that to supply all the energy used by the US in a year you would need to cover an area of eight times that of Texas with wind turbines.

Renewables are intermittent and need some sort of storage to work. Currently, they rely on the existing power gird to cover any shortfalls. The number of batteries required is not trivial. Many Tesla Gigafactories would need to be running at max throughput to satisfy the demand.

Incidentally, that is one way thay make renewables look cheap. Costs of supplying energy when the wind is not blowing or the sun is not shining is transferred to the fossil fuel industry. They are the ones having to keep plants ticking over just in case the wind drops.