You didn't miss anything, the author of the piece was just wrong. They either screwed up the math or didn't read their own link correctly, or both. Moreover, it is trivial to search for the US Dept of Education's budget for 2022 and fact check this.

It's also cited as evidence that Amazon is now more powerful than the US Government which is just factually fucking false. It really is a different breed of person that thinks some millions of dollars > sovereign power. It's like, yeah, they lobby, but they also have people lobbying against them, including near-competitors. The dynamic is not as simple as spend some $X millions of dollars and get some amount of equivalent benefit. You lobby because an entity with sovereign power can trivially destroy your business.