I know that’s just scientific ignorance on the part of the writers, but it’s not hard to make up fanwanks to get past this kind of thing. Escaping a black hole’s event horizon would no longer be impossible if faster-than-light travel were possible, but part of Star Trek lore is that warp travel involves moving through “subspace”, so you could imagine there’s some kind of energy barrier at the event horizon in subspace that isn’t seen in the normal space that we primitive 21st century types are familiar with.
