If you look really hard for something, you will find it! In this case, if you scour the entire earth for any 'unusual' cloud pattern, somewhat associated with an earthquake, then it's there! The key to success is to not have any hypothesis of what this cloud pattern will look like. Using physics is a no-no! In fact, it's best to have no hypothesis whatsoever!
In this case, they spotted an atmospheric wave over a fault in Iran. Guess what? Those faults are always associated with topography! Those are the big interior mountain thrust faults I've always talked about.