If a bank makes a loan to somebody else, the value of that loan is recorded as an asset. Customer deposits at a bank are recorded as liabilities. Even when banks loan out money to other people, they are careful to make sure that their assets exceed liabilities--and not by a small amount, but by something like 10%.

Now, not all loans are repaid, and when that happens, the bank will take a write-off of that asset, reducing its assets. In a bad financial crisis, this might hit something 5, 6, 7% of their total assets--but remember that they started with 110% assets over liabilities, so they're still left with more assets over liabilities.

The thing with Tether is that if you look at Tether's claimed accounts, their assets-to-liabilities ratio is 100.2%. When that ratio dips below 100%, you are insolvent. If I recall my math correctly, a 5% drop in the price of Bitcoin would make Tether literally insolvent.

You might argue that all the financial shenanigans are ultimately illusory, but the fact remains that the person crowing about the unreality of finance is the one that is tapdancing on an oil-soaked rope while juggling flamethrowers. And huffing ClF₃ at the same time, perhaps--they're unwilling to tell us.