There is no conclusive evidence that stuxnet was successful at all. This article https://nypost.com/2013/05/16/stuxnet-virus-might-have-improved-irans-nuclear-c

There is no conclusive evidence that stuxnet was successful at all. This article https://nypost.com/2013/05/16/stuxnet-virus-might-have-improved-irans-nuclear-capabilities-report/ https://nypost.com/2013/05/16/stuxnet-virus-might-have-impro... actually claims opposite. With cyberwarfare and espionage everything is possible so let's not guess too much as we have really limited information.