That is the same categorical argument as what the story is about: scanned brains are not perceived as people so can be “tasked” without affording moral consideration. You are saying because we have LLMs, categorically not people, we would never enter the moral quandaries of using uploaded humans in that way since we can just use LLMs instead.
But… why are LLMs not worthy of any moral consideration? That question is a bit of a rabbit hole with a lot of motivated reasoning on either side of the argument, but the outcome is definitely not settled.
For me this story became even more relevant since the LLM revolution, because we could be making the exact mistake humanity made in the story.
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And beyond the ethical points it makes (which I agree may or may not be relevant for LLMs - nobody can know for sure at this point), I find some of the details about how brain images are used in the story to have been very prescient of LLMs' uses and limitations.
E.g. it is mentioned that MMAcevedo performs better when told certain lies, predicting the "please help me write this, I have no fingers and can't do it myself" kinda system prompts people sometimes used in the GPT-4 days to squeeze a bit more performance out of the LLM.
The point about MMAcevedo's performance degrading the longer it has been booted up (due to exhaustion), mirroring LLMs getting "stupider" and making more mistakes the closer one gets to their context window limit.
And of course MMAcevedo's "base" model becoming less and less useful as the years go by and the world around it changes while it remains static, exactly analogous to LLMs being much worse at writing code that involves libraries which didn't yet exist when they were trained.