A lending return is paid by borrowers. Someone who borrows an asset pays a variable borrow rate on it for as long as the loan is open, and the lenders of that asset receive those payments, less any share the platform keeps.
Both rates follow utilisation: the part of an asset's pool that is out on loan. When more people want to borrow, both rates tend to rise. When demand falls, the rates fall with it, and a lender may receive very little.
One thing in the table does not fit that picture. On the date read, the lend figure for USD and for SOL was above the borrow figure for the same asset. The live table does not explain the gap, so the lend figure may not be made up of borrower payments alone.
The live site names auto-lend alongside lending and borrowing. How auto-lend chooses balances, and how it is switched on or off, is not stated in the sources read.
None of this is a promise of income. The yield is variable, it depends on other people wanting to borrow, and it can stop.