My neighbor is an A320 pilot and explained how the sidestick aileron control changes bank angle so once established in a bank no sidestick aileron is required unless you want to change your bank. It doesn't matter if the wings are level or in this landing when you would want some right bank to touchdown in case you encountered some gusts during touchdown. Boeing aircraft would require constant right aileron input to do the same. So since I don't see any abrupt roll movement during this landing like a big gust the side stick must have gone to left aileron to let the left wing drop as it did if the controls were working as advertised.