That's what the government said after Google paid. But also in the article:

Google said it contained "every dollar the United States could conceivably hope to recover under the damages calculation of the United States' own expert."

...

In a filing on Wednesday, Google said the DOJ previously agreed that its claims amounted to less than $1 million before trebling and pre-judgment interest. The check sent by Google was for the exact amount after trebling and interest, the filing said. But the "DOJ now ignores this undisputed fact, offering up a brand new figure, previously uncalculated by any DOJ expert, unsupported by the record, and never disclosed," Google told the court.

Siding with Google at today's hearing, Brinkema "said the amount of Google's check covered the highest possible amount the government had sought in its initial filings," the Associated Press reported.

So it sounds to me like the prosecution quoted a figure they thought was high, Google said "sure, we'll pay that," and then the prosecution scrambled to say "no, wait, we want more!" After the fact.

Google's far from my favourite company, but I really don't like the idea of the prosecution being able to arbitrarily jack up their demands after someone agrees to meet them.