I'm kind of torn on this, because on the one side I can see the developer's troubles. If they have 30 years of experience and they considered the impact of using it they will most likely know how to use it properly and ethically. Indeed many of the issues people have with AI are a kind of redirected anger, when really they are issues with capitalism, incompetency, or digital illiteracy. And the person posting the issue seems purely there to fan that flame rather than actually contribute. Something maintainers could use just as little as slop authored PRs.
But on the other hand, being open about the usage is a must. It's the price to pay for going against the grain. If your ideals and means are pure, they should be defendable and scrutinizable to reasonable people, and there should be no issue with that in the long term. Hiding the usage will create doubt about authorship, and make defenses harder to point at, while it won't stop the horde.
This ten times. It's why the online discourse around AI is often so one sided. Anyone walking into a room where people are all nodding along to the same shallow, unnuanced statements, and throwing stones at anyone that points that out or tries to share their own contradictory to the group's experience, even doing so in complete good faith, isn't going to engage for long. And so that discussion is never going to turn nuanced since all the people interested in that have been ousted.
And it sucks, because there are real harms in AI that must be guarded from for which we need widespread support. But the hostility and closed minded discussions just causes people to tune out and contrarily be more open minded towards AI as a response to the closed mindedness.