I think an unintended side effect of this tech is that people will actually have less expertise.
Like the first tweet says, you need to be a Senior to understand and write the best code with it possible. That includes fixing code it's outputting that you know is wrong.
However, Seniors really found out those shortcomings because they've gone through what every single profession must go through: the learning cycle.
You write code, shyt doesn't work, you got to fix it and understand what went wrong. With that piece of knowledge and lessons, you can now find the error in any piece of code about that topic whether written by a person or A.I. People, especially Juniors who are going to use A.I for like 99% of everything won't have the experience of fixing and making much of anything from pure scratch so they won't understand if what the A.I is doing is truly correct or not. They'll more or less accept it without verifying if it's optimal or even correct.
It'll definitely have impact on writing code no dount, but it'll make worse engineers, codebases and some very costly bugs imo without people who know what they're doing. Unfortunately, I think the longer people use it without keeping their own skills sharp, the lower their ceiling gets.
It really is like the calculator: if someone studies up and knows their material, they can do all kinds of crazy shyt with it. The normal person with weaker math skills can still add do some operations, but nothing advanced.