1. Wait, in a category where the general failure rate is traditionally 75%, using a bleeding edge technology adds 20% more risk, what a shock.
2. This is an interesting study, but perhaps limited. Draws conclusions from a set of 16 developers on very large projects, many of whom did not have previous experience with the editor used in the study or LLMs in general. The study did conclude it added time in these cases. There is a reason for the large sense of value, this would be the thing of note to uncover based on these results. Study notes 79% continued to use the AI tools. Speed is not the only value to be gained, but it was the only value measured. (Study notes this.)
3. Author didn't read or used AI to poorly summarize the poorly thought out study it is based on. Also, it seems you didn't read the study.
This article was probably written by AI, because anyone with half a brain could not read the study and come to the same conclusions.
Basically, participants spent less than half an hour, 4 times, over 4 months, writing some bullcrap SAT type essay. Some participants used AI.
So to accept the premise of the article, using an AI tool once a month for 20 minutes caused noticeable brain rot. It is silly on its face.
What the study actually showed, people don't have an investment or strong memory to output they didn't produce. Again, this is a BS essay written (mostly by undergrads) in 20 minutes, so not likely to be deep in any capacity. So to extrapolate, if you have a task that requires you to understand the output, you are less likely to have a grasp of it if you didn't help produce the output.
This would also be true of work some other person did.