The laws of physics and science are non existent in the MCU. The fact that the Hulk exists is a testament to that. The Hulk isn't any less scientific than Dr. Strange's spells. Both would be impossible to explain through science in the real world, so in a way if the Hulk actually existed in our world he would be a magical occurrence. People probably wouldn't think of it that way though, because magic has a certain connotation attached to it, which I guess is the reason people have a hard time accepting magic as advanced science in the MCU, because in their heads magic and science (even fiction science) "look" different.