They could have taken auditions from 50 voice actors, come across this one, thought to themselves "Hey, this sounds just like the actress in 'Her', great, let's use them" and that would be fine. Laurence Fishburne does not own his "welcome to the desert of the real" intonation; other people have it too, and they can be hired to read in it.
Again: the Post has this voice actor reading in the normal voice. This wasn't an impersonator.