Probably not. My point is that what (I'm assuming) is a brand new site is not built using the latest version. I would have thought that an organization such as Alphabet would want to dog food as much as possible and in doing so tell the world that 'Hey, look at this! It's super easy and pretty! You can have a site like this too if you adopt our technology'. Instead, it suggests to me that the barrier to learning the new shiny is big enough that whoever made it didn't want to learn it. That raises the question, should I learn it? Why, if even people at Alphabet don't want to? Do they doubt the long term prospects for Angular 2 so much that they hesitate in adopting it? Do they not consider it mature enough?
TL;DR I read too much into things.
Framework Ecosystem and current developer experience/knowledge/comfort level have a lot to do with it in addition to uncertainty.
Dogfooding is nice, but not at the expense of risking not having the site showcasing your new autonomous vehicle company ready by the time the press release hits.
