I think the claim in this report is that it was a state or semi-state actor. They were from "blocked regions" at a "military research institute." So dismissing the threat by solely modeling it as a disgruntled layman rando is not reasonable.
But you totally have to factor in the fact that anything coming out of Anthropic or OpenAI is part of a propaganda campaign to serve their business interests. These threats need to be addressed in ways that cause Anthropic and OpenAI pain (which means damaging their business). Because, FFS, anyone consciously racing to build doomsday devices needs a good, hard slap.