Listen to the whole context. He's responding to Joe's prompt to tell us why he bought Twitter, and —warning that it would sound melodramatic — he says he thought that Twitter had taken the mindset of the San Francisco area and amplified it and made it dominant to the point where all life on Earth was in danger. There's quite a lot of talk of the "Extinctionist" movement, and the phrase "death cult" is used repeatedly.
"If you take environmentalism to an extreme," Musk says, "You start to view humanity as a plague on the surface of the earth, like a mold or something." He asserts that the Earth could do well with 10 times as many people as we have now.
ADDED: Musk goes on to talk about AI: "If AI gets programmed by the Extinctionists, it's utility function will be the extinction of humanity."
AND: He asserts that Twitter had become "an arm of the government" — "a state publication." But: "Old Twitter was completely controlled by the far left." I think I see his point, but those statements don't fit together. The government is not the far left, so both can't be in complete control.
ALSO: "San Francisco/Berkeley is a niche ideology.... Is there a place that's more far left?... From their standpoint, everything is to the right...," Musk says. Twitter was an "accidental far-left information weapon" because the technology happened to develop in that geographic area, and then people who couldn't have created the "weapon" were nevertheless there — "co-located" — where they could pick up the weapon and make it their own.
That made me think of the old adage attributed to Napoleon: "The tools belong to the man who can use them." That seems applicable here. And then there's also the old Audre Lorde line which seems to say the opposite of what was happing at Old Twitter: "The master’s tools will never dismantle the master’s house."
BUT: "The tools belong to the man who can use them," but here, the tool that was once called Twitter belonged to the far-left denizens of San Francisco/Berkeley, but Musk arrived on the scene with enough money to buy it from them.