Lets put it another way they are destroyed because there is no gap or area to place them in. DE may create the lack of space but are not in fact the lack of space so they do not destroy the unit.
Right. So they create the effect that leads to the unit's destruction. Similar to just about everything lse (shooting,
CC, etc) that destroys a unit. After all, Dark Eldar never destroy anything, that's generally done by the rules for shooting or close combat.
I don't have the wording of the rule so I don't know the answer but does a DE unit get a token if the opposing unit flees off of the table? This, to me, is an analogous situation since the unit counts as destroyed but the unit isn't finished off by the attacker.
How is it at all analogous? I suppose in the case that
DE make the unit flee on the initial turn, and then they immediately flee of the board edge. I could see that being somewhat similar. Ok cool, thanks, more pain tokens! In the case the enemy was fleeing for multiple turns, that would be more a result of a unit failing to rally.
To be clear, in case everything I've said above is not, I really don't care what a given set of people decide allows pain tokens. The point is that the wording is very unclear, as it uses undefined terms that could be interpreted very broadly. You can make all the arguments for or against you want, but the rather firm reality of the
RAW is that it can mean anything. Maybe there's a
FAQ I missed which would set a precedent, but I haven't seen it.