Apparently this condition is only available in the C2 Legacy runtime, not in C3's.
Learn more about runtime
The microphone input example was first made in C2 Legacy, and then passed to C3's runtime and the condition was left, for compatibility purposes I guess.
It is indeed surprising though so here is a bug report to raise awareness on this issue.
Whether you are using the personal or the startup or standard business or an education plan, all the same features are unlocked and available in all those.