In very simple terms (explained by someone who also doesn’t have an amazing grasp on macroeconomics), a country’s GDP is the value of everything they produced for a given time period. So a country can owe a shit ton of money to other countries and will pretty much always have a positive GDP. When people say there was a negative GDP they probably mean it went down from last year.
Which means these people’s “logic” essentially grants them infinite money. The US economy could be in shambles, GDP decreasing every year, but they would somehow always be entitled to tens of thousands of dollars.