Brave might know you are using TOR, just like your ISP also might know you're using TOR.
The only thing is both doesn't know what site you're accessing through Tor.
There isn't yet any advantage for Brave to track who uses Tor as your ISP can throttle tor themselves.
Things like using Snowflake extension etc. helps make the network look much more normal when accessing Tor.
Notes by FeluDaBTC | export