If LLMs are going to cognitively damage kids then my kids, free from the influence of LLMs, will have the advantage of being able to think.
My oldest girl sits there with The Seasoned Schemer and her K&R and *learns*. If she was "vibe coding" she would not learn.
Other kids can give rise to the Eloi. Mine will be the Morlocks.
I'd better make sure they all have good cookbooks.