I understand that electron affinity is generally exothermic(groups 16 and 17). But, alkali metals are reluctant to gain an electron because losing electrons is beneficial for them. So, the electron gain enthalpy is termed endothermic (source: Chem libretexts) for alkali metals because it is hard to add an electron to their atoms and you need to invest energy. If it is endothermic, the electron affinity values must be positive, but they are still negative. Why? Why do the values still represent the release of energy?
In the image, the EA values of alkali metals are still negative, not positive. But in the description, it says that the process of adding an electron to alkali metals associates with the absorption of energy (endothermic- positive)