I wouldn't be surprised if this is true. Attacking infrastructure through software is a way more efficient approach than a physical attack. It can achieve a similar goal, whilst it reduces the risk of personal loss, and allows to remain unidentified as initiator (Operations Opera and Babylon are attributed to Israel without doubt, whilst it's way harder to confirm for Stuxnet).
Considering how successful Stuxnet was, it would be an obvious choice to go the same route again.