What an awful imagination. Yes there are people who don't like CSS but are forced to use it by their job so they don't learn it properly, and that's why they think CSS is rote memorization.
But overall I agree with you that if a company is too cheap to hire a person who is actually skilled at CSS, it is still better to hoist that CSS job onto LLMs than an unwilling human. Because that unwilling human is not going to learn CSS well and won't enjoy writing CSS.
On the other hand, if the company is willing to hire someone who's actually good, LLMs can't compare. It's basically the old argument of LLMs only being able to replace less good developers. In this case, you admitted that you are not good at CSS and LLMs are better than you at CSS. It's not task-dependent it's skill-dependent.