I think blog author's point was that even if AI is faster and better at coding, it's still okay to write code yourself - at least as a hobby - because that's something you enjoy.

I'm much more on your side personally though, because first, when you know there's a better and faster way to do something it does take away from the enjoyment of doing it the old way. Some of the enjoyment for me came from being unusually good at something vs. everyone else.

And second, even my hobby projects are always something that I want to make real, more than they are something that I want to do just for the fun of working on them. Even though I enjoyed the programming and puzzle solving process, the end product is still the main goal. So I'll be using AI at home as well (and it is nice to reify projects faster than before).

And all this also ignores the fact that even "only" losing your enjoyment of paid work, and not your hobby work, still sucks!

Having said all that, I recently read Use Of Weapons (1990) by Iain M. Banks and this passage encouraged me about the future:

  "Can’t machines build these faster?" he asked the woman, looking
  around the starship shell.
  "Why, of course!" she laughed.
  "Then why do you do it?"
  "It’s fun. You see one of these big mothers sail out those doors
  for the first time, heading for deep space, three hundred people
  on board, everything working, the Mind quite happy, and you think,
  I helped build that.
  The fact a machine could have done it faster doesn’t alter the fact
  that it was you who actually did it."
  
  "Hmm," he said.
  "Well, you may 'hmm' as you wish," the woman said,
  approaching a translucent hologram of the half-completed ship,
  where a few other construction workers were standing, 
  pointing inside the model and talking.
  "But have you ever been gliding or swum underwater?"
  "Yes," he agreed.
  The woman shrugged. "Yet birds fly better than we do, and fish
  swim better. Do we stop gliding or swimming because of this?"
  He smiled. "I suppose not."
  "You suppose correctly," the woman said.
  "And why?" She looked at him, grinning. "Because it’s fun."