You addressed only 1 of my example points and your post doesn't explain how USD is not essentially "printed" (digitally) out of thin air (or I'm too dumb to read which is entirely possible).
Look up the meaning of "failures to deliver" in the stock market. In short: it means stocks sold by market makers and never delivered. AKA: they take your money when you buy a stock, it appears in your account, but they didn't actually deliver anything.
Then look up how many of those happen daily in any US stock.
Or read up here: Naked, Short and Greedy: Wall Street's Failure to Deliver by Susanne Trimbath