That is Facebook ad spend, not the total cost of the attack. It doesn't include other things described in the paragraph that the IRA did, like organizing Trump

That is Facebook ad spend, not the total cost of the attack. It doesn't include other things described in the paragraph that the IRA did, like organizing Trump rallies and running troll farms where they posed as Americans on social media. It also doesn't cover things like paying for the operation to infiltrate the NRA etc. And then of course there could be stuff we don't know about