https://www.tapology.com/fightcenter/promotions/1-ultimate-fighting-championship-ufc
While we don't have gate totals for the events in Brazil, we do know the attendance. Nunes vs. Pennington had an attendance of only 10,700 (including Machida vs. Belfort on the undercard), only slightly larger than the last two Fight Nights in Brazil, Santos vs. Anders at 9,500 and Machida vs. Anders at 10,100. Even if we're looking at the same city and arena, the last time UFC was there was for Machida vs. Brunson in late 2017, and that had an attendance of about 10,300.
Cyborg vs. Kunitskaya, despite the respectable 260k PPV buys, was a very weak $1.37 million live gate in Las Vegas of all places.
Comparing it to PPVs with similar buyrates, Whittaker vs. Romero 2 did 250k PPV buys, but had a $2.55 million live gate. Dillishaw vs. Garbrandt 2 did 300k PPV buys with a $2.85 million live gate.
To be fair, Nunes vs. Shevchenko 2's live gate, while still below average, is actually better than one might think from its 100k buyrate, as it garnered $2.03 million in Edmonton. That's slightly better than Woodley vs. Till (second worst event of 2018 after Nunes vs. Pennington) in Dallas, which had 130k buys and a live gate of $1.71 million.