Interest Rate - Inflation Rate = Real Rate. The debtor is benefiting from a negative real rate since, in theory, the money is worth more now than later. Negative real rate is an indicator that the creditor miscalculated the 'cost' of money in the future.
By inflating the debt away, the debtor is printing money and using the asymmetry of knowledge about money supply to essentially defraud the creditor of assets.
Whoever took out a 30yr mortgage at 3% while inflation was at 7%, they were benefiting from a -4% real rate. The mortgage provider (actually the banks) are paying the homeowners 4% annually in net value while the annual inflation rate was 7%.
Hope this clarifies the situation
nostr:note1uzqut7e0fnlhr02x6vt5ap2rn7eejp8066vr0ldjlr0qwq32w7vsnnanp3