She used Apple as an example too, which around here is uncontroversial. If you want to learn more, she wrote an entire book explaining the article's statement: "And every technology that makes the iPhone a smartphone owes its vision and funding to the state: the Internet, GPS, touch-screen displays, and even the voice-activated smartphone assistant Siri all received state cash. The U.S. Defense Advanced Research Projects Agency bankrolled the Internet, and the CIA and the military funded GPS."
Furthermore, she clarifies in her TEDx talk [1], that Nokia's problems are its own executives' misjudgements, as is clear. (Just as the US isn't responsible for every failed US tech firm.) Nokia obviously did quite well from state subsidies, just as US firms do. (I recommend this TEDx talk, which goes deeper into the context than the brief Slate article.)
I find Mazzucato quite reserved in her critique of religious economic ideology, despite people willfully reading "madness" into a brief Slate essay, rather than carefully investigating her work. Not only did she explain in a book, but she even made a Youtube channel investigating this theme with other economic/political figures. [2] Her work came from an INET grant [3], not an insignificant institution. [4]
[1] http://www.youtube.com/watch?v=jyp3Bw5H0VA
[2] http://www.youtube.com/user/RethinkingTheState
[3] http://ineteconomics.org/blog/institute/ha-joon-chang-and-ma...
[4] http://en.wikipedia.org/wiki/Institute_for_New_Economic_Thin...