My config: Brave 1.77.101 with Chrome 135.0.7049.115, Windows 10 Home x64 22H2
Whether I use a normal, private, or private Tor window, the block lists subscribed by Brave are visible. To see this, visit https://browserleaks.com/, and select the Content Filters test.
Sites should only be able to detect if a visitor is using an adblocker by noticing the visitor’s web client is not retrieving all resources specified within a web page. The site should NOT be able to detect the visitor is using an adblocker by simply getting that info directly from the web client.