The actual post is behind a login wall, but I don't see from the BBC article that he's even advocating any action. Is he demanding the immediate shutdown of the data centres? Raids on the labs? Coordinated global action to impound and destroy the equipment? Life imprisonment for anybody found training large neural networks? Rogue researchers declared hostis humani generis? There's no mention of it.
That's what I'd be advocating at the very least. Then the question of whether to take direct action personally on top of that would be one of practicality - can I lay my hands on the right equipment, how can I do the most effective damage, do I have access to high value targets, will it be dramatic enough to frighten new recruits away from joining the industry, will others be inspired to follow my example, should I take the time first to form a team for more extensive action, that kind of thing. It wouldn't be a question of whether it should happen, only one of whether those are the right tactics. Yes, in all probability I'd decide I wasn't personally cut out for terrorism or assassination, but not everybody would decide so. It would be a reasonable choice in the circumstances.
If the expected bodycount from the operation of this industry over the next ten years was approximately eight hundred billion, then that would make AI researchers the single most dangerous group of human beings that has ever existed. The National Socialist German Workers' Party, previous title holders for the worst people ever, probably didn't kill even a tenth as many as this man says he expects AI firms to kill in roughly the same timescale. That is the comparison that would frame my thinking about AI researchers and what we should do with them, if I believed what he says he believes.
And I just don't see that kind of thing coming up in these conversations. People calmly and academically discuss their probability estimates as if it's a question of pure theory, not the imminent destruction of all humanity. If they really believed what they say, there would certainly by now be AI Luigis everywhere, data centres would be burning, and people would be quitting the industry all over the world for their own safety. That simply isn't happening. So I don't believe they actually do think that this outcome is likely. Actions speak louder than words, and their actions say they don't believe a word of it.