Artists have been using assistants to get their work done since forever; in modern times, Jeff Koons and Damien Hirst are famous for doing little or none of the actual fabrication of the artworks which bear their signatures.
You are right that this is a new process, in which a machine does work that was previously done by a human, but I don't think that means the human is not an artist. Consider the DJ, who "merely" plays back other people's records: yet there's a whole art form in weaving disparate music together. Or, consider, is a composer a musician? The only sound they make is that of a pen scratching on paper; it's not until a room full of other musicians perform the score that you actually hear any music. Yet we still think of the writing of that score as an artistic act.
You are right that this is a new process, in which a machine does work that was previously done by a human, but I don't think that means the human is not an artist. Consider the DJ, who "merely" plays back other people's records: yet there's a whole art form in weaving disparate music together. Or, consider, is a composer a musician? The only sound they make is that of a pen scratching on paper; it's not until a room full of other musicians perform the score that you actually hear any music. Yet we still think of the writing of that score as an artistic act.