That bit in the Spectator article demonstrates a misunderstanding of why there's a backlash against AI-generated content. AI creating visual art isn't going to stop people from creating their own art; the problem is that if AI art is as good as human-produced art, artists will not be able to find work as artists - why pay salaries or fees to stables of artists when you can just buy software to do the same thing?

Writing AI may do the same thing to journalists and authors, but as you pointed out, it won't affect hobbyists.