I've never heard of anything like this from AI ethicists though, the language they use tends to be more in alignment with HR people or priests in a moral panic than engineers, and is usually either completely fantastical doomsdaying, or all or nothing thinking, often implying the only way to mitigate the chatbot saying something naughty is to lobotomize it entirely instead of some external control measure, such as limiting the audience or presenting a disclaimer based on sentiment analysis for example. It's not surprising to me that they have lost credibility here, I certainly struggle to take them seriously.
I guess with AI taking over a reasonable number of dumb jobs, the next iteration is going to be AI ethicists.
Neither "alignment" fine-tuning nor output filters are likely to be 100% effective, and a single failure can be disastrous.