Def Jam already gave their numbers to billboard and considering Live Nation didn't refute the numbers, there's no reason to think the numbers would be falsified. Anyways Pollstar is based in estimation and if they don't have enough info to make an educated guess than the numbers will be off as stated by their own representative
Def Jam has nothing to do with Billboard Boxscores.
It's reported through Live Nation, or whoever the artist's tour company is. It would highly unethical and actually illegal to falsify boxscore grosses as it would be misrepresenting their performance to stock holders.
It's blatantly clear the numbers are considerably off for Pollstar. They just estimate anyway, wait for the rest of Billboard's.
Taylor slaying her 3rd tour in a row. Such a touring force. Great for Rihanna for making it into the top 11 but i thought she was the biggest black touring force?