Exactly.
Even if his other divorce would have been finalized 1 day, 1 min, 1 month before the interview, his current wife would still have been denied visa. Why? 2 marriages overlapped.
For you to benefit, there shouldn't be any overlap, regardless that there's one ongoing divorce case. US divorce and marriages are dependent, nor independent. One has to end before the other starts.
While you can remarry in Pakistan while your current divorce is processing, if you're to seek US immigration benefit, there shouldn't be any overlap. If overlap occurred years ago when you had no interest in going to US, but now things have changed, you'll still have to divorce current wife, then remarry her to seek benefit. Dates can't overlap