This article has different numbers for the emissions of CO2 equivalents than the one from our world in data article. Numbers in the literature seems to vary widely (from 3.7 to over 110 g(CO2 equiv)/kWh). The “our world in data” article seems to use the lowest value from the literature and rounds off (from 3.7 to 3).
Also the dw article has some other good points that aren’t mentioned often enough (nuclear is more expensive than renewables, has longer construction times and may have to be shut down in hot summers, when the rivers for cooling run low).