That wasn't the argument at all.
If I wrote a card game in 3 months, then cloned the repository and used that as a base to implement a different card game, it would be significantly faster with or without LLMs.
The argument is that it's not really an apples-to-apples comparison. "I wrote a game in 3 months and then used an LLM in 3 days to fork it and make some changes" is not the same thing as "I spent 3 months doing something that I could do in 3 days with LLMs".
I believe LLM-driven development is powerful (though I hate seeing "10x" everywhere, and have hated it long before LLM coding was big, when it was talking about supposedly superhuman coders), but this is not a good comparison, and the argument is sound.