Not exactly...
Brave is based off of the chromium browser, which is the open-source core of chrome and many other browsers.
So essentially chrome and brave share common internals, but have different amounts of corporate bloat and spyware added on top
The FBI could convince me they were doing a good job if they published a full account of their investigation, the shooters public and private posts and motives, a timeline of events going back years related to his gun and politics, and finally, a lot of procedural changes to prevent this type of occurrence happening again.
Without that level of thoroughness it will always feel like they are the insiders and this was a coverup