Earlier quoted context omitted.
Everyone’s focusing on that because they want to discuss the interesting bit - is it sentient. What you’re pointing out is true, but not really interesting to discuss because everyone already knows that and it’s not that controversial. (For limited values of everyone. Obvi not all readers actually know that.) I mean, it could be interesting to discuss a more European style of employment where he couldn’t be fired for…
Everybody already knows that code running on a computer cannot become sentient. I don't know why this is interesting. Someone said a dumb thing, breached their contract, and got fired for it. The end.
This is very much not "known". Some people believe it, but nobody knows.