All data used in this presentation is downloaded from the FDIC site operated by the US Government (https://www7.fdic.gov/sdi/download_large_list_outside.asp). They operate a public page on which they publish all of their quarterly reports. (Outstanding Debt, Whether it is being actively repaid, how long since the last payment)
In addition, the Department of Agriculture tabulates land use data (https://www.ers.usda.gov/data-products/major-land-uses.aspx), which was used to normalize the debt load since states with large amounts of land area would naturally have more debt on an absolute basis.