Which product at Google took six months or less to develop from scratch?

This is not to say that a six month development cycle is impossible. There just has to be an understanding that there will be a trade-off in quality. Maybe Mayer is in the "get something out there fast, and reiterate based on feedback" boat (which would make me respect her more) but going from 0 to 100 in six months is impossible with the scale of projects Yahoo! works on.

Statements you make and policies that you implement for your company say a lot more about your naïveté than positions you previously held.

Assuming naivety is neglecting multiple data points, among them her extensive experience at Google working on or with some of their most successful projects.

Why start there? Why not look at the whole picture and loan her the benefit of the doubt, saying, "I believe with your experience it's likely that you're familiar with software development. Therefore I won't assume this is a massive brainfart, even if part of my mental model of the world thinks it could be. Without that assumption, what are you trying to communicate with this, and why? What can I learn from this, and do I need to update my mental model?"

Assuming naivety is unreasonably dismissive, and says more about the critic than the policy or policymaker.