But is the Topics API part of upstream Chromium? Because I'm not a browser developer, but the article does not say that the Topics API is being added to Chromiu

But is the Topics API part of upstream Chromium? Because I'm not a browser developer, but the article does not say that the Topics API is being added to Chromium. It says that the Topics API is being added to Google Chrome. I don't want to presume the outcome of whatever you respond to the former question with, because as I said, I am not a browser developer. But it would seem to me that your argument is irrelevant to the conversation at hand.