I don't think it's a no-win situation, but only time will tell. He's got a wrong concept of piano (and if he likes video games, isn't that just pushing buttons too? Well, of course, but there's cool stuff going on when you push them, just like in piano
). So now you should take steps to show him that there's a lot more than pushing buttons....you actually get to communicate emotion!
I would break the ice by doing some improv with him. I do this with resistant students all the time, and it really gets them to realize they are musical, it's fun, and they can't be wrong! Keep it simple, and make sure you play with them. Improvising alone is not as fun as with someone else. Stick with black keys to start, something slow, and encourage them to just start doodling if they're not sure what to do. Eventually they'll come up with ideas on what sounds to make. Some kids are shy to begin with, so really just get him to start playing anything
, and not worry about it being good.
Sometimes children don't like piano because emotionally they are afraid , perhaps of not being good, being judged, etc. Sometimes, they just don't like piano. Either way, you have him for 8 lessons and so you might as well make the best of it you can. Be sure that you have a little talk with him first, that you are aware he doesn't want to be there, but ask him to agree to at least make the best of it by trying what you ask him to do. Act like you're on his side, not the parents, and that you're just doing the best you can in the situation.