I'm sure that was done by a person, at least if it was old enough it was. There's a lot of nuance with translation that can be lost, like puns and alliteration. I'm sure this would do the same.
The textbook was written probably 20 years ago, so definitely done by a person. Same thing with the video material we watched. There was a sequential TV series called Treffpunkt Berlin, which was created to teach German. The plot and dialogue were deliberately simple, growing complex only at the end