That is a stat you invented out of thin air, based upon nothing but pejorative hope, against all logic or rational consideration of the timeline or the scale of the project, and you declare it the "elephant in the room"?
HN is so weird on the topic of AI, and so many desperately are trying to contrive a reality. Odd stuff.
It's not an invention it's a question. If the number is <20% that's great news for the Chrome team.