The article says it converts infrared into visible light, not necessarily just green light. Until some human actually tries it won’t know exactly what he does see, but I don’t think it follows that daylight would be overwhelming. He may just have enhanced vision during the day because you can see the infrared as well as the visible light reflections.
No. Just no. Dumb idea. The guy would be seeing green for the rest of his life. Think of him not ever, ever, ever being able to go to a beach, or on a boat without wearing welders glasses.
But I don’t think I wanna be the first want to try it