Why does anyone think the public is owed any information on the Dillards, or any of the other Duggars/adjacents? Derick can stretch the truth as much as he wants. These adults get to choose what and how much they share. Isn't it enough that the Duggar brood's privacy was sold by their father? Derick and Jill are former tv personalities. Just because people want to know does not mean they're under any obligation to disclose anything about their finances, their children's births or their fertility. They can tease all they want, withhold what they want, spin what they want. Their audience is not entitled to anything. Don't like it, don't follow.
I'm sure this is an unpopular opinion here, where we can collate all the info in various media, their show/books, speculate wildly and deep-dive into public records. It's fun and interesting for me because their world is so foreign and I find religion fascinating (and weird, no offense intended), but they owe us nothing.