I'm curious how you would even know? If Google is making ML breakthroughs, I think it's quite obvious they won't be immediately publishing them if they are actually commercially useful.
Or put another way, they could currently be holding back 90% of their current research and only releasing 10%.
I'm not saying that is the case, it's just I think private research into some fields is much more opaque than folks (myself) realize. Relying on Google (or any other private company) to publish findings is likely not a path for long-term success.