What’s interesting is BRV010 is the referral code to say it was clicked on through Google. So it shouldn’t be showing on the main page. It definitely wasn’t showing like that for me on Windows. But might be some weird thing.
Anyway, just a FYI, the codes you’re speaking about are just little tidbits to show where the person clicked to download from. You can see a bit of an explanation about this at Brave Browser Referral Codes Update
Anyway, at least Mattches seems to have checked it out and seen what you’ve noticed. Guessing they’ll get it fixed.