No. The result is less output at the plant equal to the solar surplus. Carbon capture is not required to make the net effect negative. Less carbon/kWh.
The definition is it must negate CO2 present in the atmosphere, not prevent more output into it. If all hydrocarbon process were flipped to renewals overnight, energy production would remain and carbon release would seize (aka neutral), but already present CO2 and its greenhouse effect would not disappear.