Brave's adblocker won't do anything against Google's trackers if Google builds it in to the engine.
Again, I advise against trusting anything Chromium-based.
Also, you apparently haven't heard of uBlock Origin's Medium Mode. Brave can't even touch that. There's more than just advertising to worry about on the web.
That's true but not that big of a deal in their case. The built-in ad blocker works quite well and removes the need to run uBlock Origin.