why did i read it as "usde btc lock"

And in reality, its far worse. These 'official' figures dont account for unfunded liabilities. Like this for an example (and this was 8 yrs ago). https://www.forbes.com/sites/johnmauldin/2017/10/10/your-pension-is-a-lie-theres-210-trillion-of-liabilities-our-government-cant-fulfill/

Toot toot🚂