Further, you don't actually need to respond to every stupid, incorrect statement on the Internet that's written about your new employer. Really.
By the way, his email address is in his profile. If you were really that concerned about "communicating with care" you could be a professional about it and mention it privately to him. Of course, that wouldn't satisfy your need to respond to every stupid, incorrect statement he makes about his new employer, really.
(Ultimately, I see the risk in saying "I think XXX" if Google decides to someday do the opposite of XXX. But there is some limit; I'm still going to say that writing unit tests is good even if Google's official message to investors becomes "testing is a waste of time". That's because I'm me, and I have my own opinions. If Google wants to make an official statement, they have a blog for that. If someone wants to misconstrue a personal opinion of mine as an official statement, well... let's just say that their Pulitzer hopes may be dashed...)