If you don't know what SoTB is, it stands for South of The Border, the U.S. - MX border. In MX (and I believe the rest of the Spanish speaking world) a billion is a million million.
Here is a link that describes the costs of a train that's being built between Cancun and Palenque:
https://www.eleconomista.com.mx/est...-del-Tren-Maya-aumenta-150-20220807-0077.html
Even if you don't speak Spanish, you can tell what it says:
So, uhh to you to, Sir.