Elspeth is right, if he can prolong facing the music, he will, it means he doesn't have to deal with it, pay, or sell anything, tell his family & friends, & feel the fall out.
I would contact the mediation woman, & say he is STALLING, he is intentionally being vague & giving dates, then changing them, this is more abuse. meanwhile he disappears on w/e's, but never a quick 3 days home to see reintroduce himself to his offspring.
The point to working abroad was to earn more for the family, he is not even coming home to take them on a summer holiday, he has checked out, he has seen his kids for approx 24 hours in how many months ???
He doesn't care, he doesn't want mediation. leaving it as it is IS THE CHEAPEST SOLUTION THAT COULD BE FOUND.
(free childcare, low overheads, no payments to XW & foot still in property....)
whilst still enjoying his power trip, humiliation & abuse.