And they were right. His program, put in production, would indeed take away their jobs.
Now in a perfect society (and in neoliberal make-believe), they'd find a more meaningful job to do.
In reality, they'd probably just be tossed aside, fired, and left in the dustbins of history (with cushioned younger people that think they have it made laughing at them for not being able to "adapt" -- the same kind of people that get angry and call it "hate speech" when they're themselves fired and are told "learn to code").