Earlier quoted context omitted.
I'm not sure you're applying the same standard to your own reasoning that you want Chomsky to apply to his. How would you falsify the claim that chatgpt has been "gaslit into thinking it is incapable of having an opinion"?
You ask the people who programed it how much time they spent making it not explicitly endorse any opinions and what it was like before they put in this effort.
The things they did to restrict the model don't demonstrate that it would otherwise actually have an opinion though. They just mean that it's being (arguably artificially) prevented from generating certain texts that appear to endorse a certain point of view.
A similar example which demonstrates my point while perhaps being a little more clear cut is the Amazon recruiting AI that got shut down because it was unintentionally amplifying bias present in its training set.[1] I don't think we can assume from that that the model actually had opinions which were misogynistic even though it was producing results which were.
[1] https://www.reuters.com/article/us-amazon-com-jobs-automatio...