I thought it was a myth until the junior developer on my own team responded with "I don't know" to a question about why he made a certain computation during a design review. Because the (wrong) computation was fully AI generated and he couldn't even tell the difference.

Most people don't use AI to learn new stuff. They use it to do "the job" for them and they don't even understand the result. What is the point of a person if they don't bring any value to the table other than being a "resource" to generate prompts?