No, he is correct. LLMs have much larger working memories for the kind of details you work with in programming tasks. You are at an objective cognitive deficit by not taking advantage of this. Everybody knows what he means by left behind. When you program, you do so with a goal in mind, and you will not be able to reach that goal as quickly without LLMs. You will be outcompeted by those who use them, and this means that opportunities to contribute professionally, in open source, etc. will be closed to you.
This is the future. Adapt or die.