Already shared, but that (what you linked to) was a proposal and no deliverable was ever publicly released. A simple prototype was made and tested by a limited number of employees - instead of showing an ad, it would show a picture of a mustachioed man as a placeholder. That silly picture would be replaced with real code if the idea panned out. It didn't. The idea and the code was canned before I joined Brave and I've been here for almost 10 years (I joined August 2016).

Disclaimer in case it's not obvious: I am a Brave employee