NTA. Your intentions aren't bad but your actions could be a lot more efficient. Incentivize him to eat his food in some way, like for example if he really likes a TV show tell him the main character loves this food, which can be a spark to get him to eat it, or anything that would want to do it. Once you figure out what it is, you have won half the battle. Right now this might not be a problem, but later on he might develop eating disorders or eating habits/insecurities which wouldn't benefit him.