They're the actual numbers. They don't use inflation-adjusted numbers to state the debt.I am not betting the ranch on Data that is "Inflation-adjusted" via CPI-U. Those are adjusted numbers, not the actual numbers. Why not just use the actual numbers unless you are trying to make someone look better or worse?
If they did, they'd be saying the debt in 1980 was $3.6 Billion, and not the $900 Million they state it as, and so on.

They might use inflation adjustments to make valid comparisons of data (like when they compare the cost of a car today versus 20 years ago), but you can see the actual figures and do the comparison math to verify:
U.S. National Debt by Year
The U.S. national debt is the total of what the federal government owes creditors. The U.S. has always carried debt, but the total has expanded rapidly since 2008.
