A player in my club specializes in smashing loops also. A few ideas without video.
Loop at his body or elbow. If you loop into his hitting zone on either side you are just feeding him.
Make your loops lower, or else very high. It sounds like you are playing safe loops vs push. Those are very safe if your opponent will block. If they smash or counterloop then medium height loops are like instant death. It's surprisingly hard to smash high bouncing loops, so shoulder/head high on his side is better than chest-high. Of course net height is better than either of those. You will have to swing more forward and less upwards to get a lower bouncing loop vs push.
Change up the amount of spin on your loops. Flat hitting style demands lots of confidence. If some of your loops have hardly any spin his smashes will go in the net. If the next one has huge spin he will smash off the end. If you shake his confidence in his ability to smash then his accuracy will fall just from thinking too much.
Last resort and not really recommended is to play one or two pushes and look for a less-good push from him so it's easier for you to make an open with good placement or low bounce. But since pushing is his game and not yours, chances are this will fail.