Better metric is relative to Mexican, or North American, profits. Those are the markets in which they did their shenanigans. Relative to those, it’s a substantial absolute and relative sum.
If I'm interpreting the article correctly, they made at least $888 million off of their scheme. It's likely that a significant amount of their illicit profit was not detected by the enforcement agencies, so $2 billion sounds like they potentially profited even factoring in the fine, it's only a little over twice their profit.