It is one of the game changers of AI. It used to be a that the barrier of entry of creating a new tool was high - so we had to use popular pieces of software, often stretching them, or writing plugins (that had their own constraints). Now it is often easier to write from scratch a new piece of software, for which with have full control. We can stand on the shoulders of giants - not just "a giant".
I'm sorry, I don't get your comment. What makes you think the approach or the code described in the article were developed by an LLM?
But based on my experience with multiple project, both current frameworks and AI changed the game. I used to much more reply on existing software and cursing that they don't do what I want - as the time to create a personalized tool was simply much to afford. Now often it is quicker to create a personalized tool than fight with existing one.