You are the one who is claiming that they've saved $1.82 Billion dolars by posting some random website that thinks illegally destroying a federal agency is fiscally responsible.
Just embrace it. If they’re making claims, it would actually be prudent to document those claims and ask them about their methodology. Ask them if they consider any costs from second-order effects as subtracting from the total. If not, why not?
Calculate the totals yourself. Report the data to as many as possible. If you think it will look as bad as I do, there’s every reason to.