Everyone has problems. Welcome to life.
But once you start taking money, you change the equation. Once you start taking money, you now have responsibility.
This dev may have the most valid excuses in the world. It doesn't change the fact that it's a huge disappointment to many of the paid supporters and backers of this project. And unfortunately for the dev, this stuff happens constantly with adult games, even more so than non-porn games. Dev starts a project, gets some money, loses interest or they run into various "real life struggles", and they quit. It happens all the time.
So again, unfortunately for this dev, even if their struggles are legitimate, even if their reasons are just, it's still just another disappointment in the constant barrage of adult game dev disappointments. Except with this one, they actually had a unique idea, a really solid foundation, and are just leaving it completely to die without even attempting to wrap up loose ends.
And as far as my project goes, it'll be finished. Granted, I may die before that time and it will go unreleased, but at least I won't take people's money for it before that happens.