Nah, I disagree. First, individuals who were educated across the globe, money from across the globe, and access to global resources are all necessary (and a fundamental part of the history) of Silicon Valley's success.
There really is no argument that Silicon Valley-like innovation do occur in distinctly non-free environments. For example; The Soviet Union's part in the Space Race, the current entrepreneurial and technological development in China, the British component of the Industrial Revolution.
Each of these demonstrate scientific innovation in otherwise less-free societies than California. I'm sure there are many more examples if you wanted to extend the historic timeline further.
Not an endorsement of the CCP.