Aside from the problem that zero evidence is presented that "employees aren't returning to work in America," the idea that they're freelancing instead is just outlandish. It's the kind of thing you might expect a successful but out-of-touch entrepreneur to spout.
Paycheck-to-paycheck living, which has been amply documented, means you have no agency. You work or you begin your journey down the social ladder. Often you do both. Assuming employees aren't returning to work, there can only be two reasons:
1. there are no jobs, despite what employers might be saying; or
2. government transfers (extended unemployment, etc.) have been keeping them afloat.
Extended unemployment (extra $300/week) ended in all 50 states around Labor Day.
https://www.forbes.com/sites/zackfriedman/2021/09/05/unemplo...
That leaves just (1). It's a doozy, because if jobs have really disappeared and government transfers are really done, then we are about to witness what happens when millions of people suddenly don't just lose their jobs, but their ability to pay for basic needs.