I don't see problems here. It's a tech pilot, not a product. The goal is to prove it viable, maybe the team size is even small. Spending much time on browser compability too early may not be that wise if they just need hundreds or thousands of testers.
This is literally testing streaming to Chrome. I'm guessing that optimizing this required some serious client side support, so it would make sense why it would only work for Chrome. That being said if it takes off, I can easily other browsers supporting a standard.