It's very alive. It's being used for Google Nest hub devices. Through for HN that might as well it being dead, it seems.

“Rumors of my death are greatly exaggerated”

Google folks pop up here and there and say it’s actively worked on. Unless you have more recent information, I believe the project is still alive.

I thought it was the opposite and that it would replace Linux for Google products

Citation needed? I don’t disbelieve you but I haven’t seen anything concrete.