Carpe Diem:
FYO, either way, the rule is not coded; it is not enforced by BK in any way. I had many games where I discussed it with my opponents, and many of them agree to follow the rule 'voluntarily' (as I do). The ones that ignore the rule and my request, I don't do it either anymore.

I would interpret the rule in the way you do - if you cannot move anywhere with any dice role, your opponent must open up something somewhere.
But maybe we should find someone who seriously plays Fevga outside of BK, for example in Turkey or Cyprus, where it is very common, and find out what the real-world official rules are. _If there are_ any official rules.