Earlier quoted context omitted.
They did not build a AGI yet so they have build as many AGIs as anyone else and therefore they are also laypersons regarding the effects of AGI on humanity.
Is your position that the only people who will ever be qualified to have an opinion that AGI is a threat that might destroy humanity, are the people who have already successfully built this thing? If that is the case, by what means might any credible warning be provided before a possibly-humanity-destroying AGI gets made? That's rather like saying "the only credible way to tell if there's a gas leak is to strike a ma…
This is especially obvious since opinion differ so much about the effects of AGI on humanity and since you cannot prove them right or wrong, every opinion is equally realistic as each other.
Like I could say that every AGI that becomes self aware will kill itself instantly because of boringness, and you cannot prove me wrong.
We just don’t know yet.