There's some grim humor in the fact that the poster reflects on his sister's use of chatgpt, and just ends on that point. I have to wonder if he decided to talk to her or his parents about the situation. I didn't see anything in the post to suggest it, just a "this next generation is cooked." Who cooked them is the question? Children won't raise themselves generally.
My daughter is only 1 and a half years old now, but my concern is more that she'll be implicitly competing with classmates that are using tools like this, whether we allow her to use them or not.
Want to give them a leg up, get the 'What every first grader should know' books, and continue with the next one each year. There's way less friction in learning when your child experiences multiple exposures to the material being taught.