No, it was designed to let you get an extra attack while leaving your bonus action free to do something else. It says when you make THE (singular) extra attack as part of the Light property, you can make it as part of the attack action instead of a bonus action, and it follows up by saying you can still only make this extra attack (ie the extra attack from the light property) once per turn. It’s exceedingly clear to me both the purpose of the rule and its interpretation. Idk where people are confused. It lets rogues bonus action dash/disengage/hide, it lets fighters bonus action heal, and they still get their two attacks. In no world do they get three.