Even if it did better in trades, the book was losing money in single issues. A lot of money. Trades alone don't sell well enough. It would have to be selling "well enough" in trades to be topping the charts. It does not show up in the top 1000 graphic novels from Diamond in 2018. Try finding it in any list of top sellers as tracked through BookScan.
While I know these numbers don't tell the whole story, they show us enough, enough to know that simply saying "sells well in trades" is just too convenient a claim to overlook everything else.