I think this is a different kind of verification (nice job YT by being the most confusing), cause even my personal account is verified, but not BIG verified...
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
I think this is a different kind of verification (nice job YT by being the most confusing), cause even my personal account is verified, but not BIG verified...