I'm assuming that by Dark Elves you mean Ssri'Tel'Quessir, subrace of elves which became drow during the Dark Disaster.
In CD timeline, drow aren't reverting to the Dark Elf state, since those events were described in the Blackstaff (restoration of Miyeritar) and Ascendancy of the Last novels. Drow are drow and that's it. Someone might refer to them as Dark Elves, but they are still drow we all know. CD doesn't recognise these due to the following:
* Novels aren't considered canon,
* These events are post 1372DR.
There can be some speculations made as to what these Dark Elves would be like, but since they're irrelevant to CD's timeline, it would be better to take them elsewhere
In CD timeline, drow aren't reverting to the Dark Elf state, since those events were described in the Blackstaff (restoration of Miyeritar) and Ascendancy of the Last novels. Drow are drow and that's it. Someone might refer to them as Dark Elves, but they are still drow we all know. CD doesn't recognise these due to the following:
* Novels aren't considered canon,
* These events are post 1372DR.
There can be some speculations made as to what these Dark Elves would be like, but since they're irrelevant to CD's timeline, it would be better to take them elsewhere