I wish I could tell you, but I have no idea. Some cats really seem to just have a thing about wanting to have people around when they eat but I’ve never heard a good scientific explanation for it other than it just being a personal preference.
One of our cats does this as well, though generally not with a specific person. If he’s feeling stubborn, he won’t eat until you stand near his food for a moment or two.
Sometimes cats are just weird.