Earlier quoted context omitted.
There is no reason for anyone with a wind park to sell cheap if there are customers willing to pay a high price. That said with a battery and dynamic prices, there are many days where you can charge a battery when the prices are low and use them battery when the prices are high.
Constant pricing means they make more when wholesale prices tank and less when whole prices rise. I’ll sell you X% of my output for Y$/kWh is a perfectly valid strategy and batteries can absorb output spikes just as they absorb blackouts. Hedges like this are a useful risk mitigation strategy as going bankrupt is a much larger downside than making slightly more money.
So the consumer does not gain anything.