I'm not sure that's a fair take.
I don't think it's an unfair statement that LLM-generated code typically is not very good - you can work with it and set up enough guard rails and guidance and whatnot that it can start to produce decent code, but out of the box, speed is definitely the selling point. They're basically junior interns.
If you consider an engineer's job to be writing code, sure, you could read OP's post as a shot, but I tend to switch between the personas they're listing pretty regularly in my job, and I think the read's about right.
To the OP's point, if the thing you like doing is actually crafting and writing the code, the LLMs have substantially less value - they're doing the thing you like doing and they're not putting the care into it you normally would. It's like giving a painter an inkjet printer - sure, it's faster, but that's not really the point here. Typically, when building the part of the system that's doing the heavy lifting, I'm writing that myself. That's where the dragons live, that's what's gotta be right, and it's usually not worth the effort to incorporate the LLMs.
If you're trying to build something that will provide long-term value to other people, the LLMs can reduce some of the boilerplate stuff (convert this spec into a struct, create matching endpoints for these other four objects, etc) - the "I build one, it builds the rest" model tends to actually work pretty well and can be a real force multiplier (alternatively, you can wind up in a state where the LLM has absolutely no idea what you're doing and its proposals are totally unhinged, or worse, where it's introducing bugs because it doesn't quite understand which objects are which).
If you've got your product manager hat on, being able to quickly prototype designs and interactions can make a huge, huge difference in what kind of feedback you get from your users - "hey try this out and let me know what you think" as opposed to "would you use this imaginary thing if I built it?" The point is to poke at the toy, not build something durable.
Same with the MVP/technical prototyping - usually the question you're trying to answer is "would this work at all", and letting the LLM crap out the shittiest version of the thing that could possibly work is often sufficient to find out.
The thing is, I think these are all things good engineers _do_. We're not always painting the Sistine Chapel, we also have to build the rest of the building, run the plumbing, design the thing, and try to get buy-in from the relevant parties. LLMs are a tool like any other - they're not the one you pull out when you're painting Adam, but an awful lot of our work doesn't need to be done to that standard.