Three things changed during the pandemic: 1) the government paid a huge amount of money to people to not work for a long time, 2) people got used to living much more cheaply than they had before due everything being closed, and 3) the immigration and trade market shifted significantly. So suddenly you have a large number of people who, at least temporarily, have options that they didn't have before and who probably aren't competing with the same size labor pool that they did before.
The whole narrative that Americans are suddenly waking up and realizing that they should all be entrepreneurs and follow their dreams is at best a feel-good second-order effect. It's a nice story, but the only reason new business starts are so high right now is because there were so many business closures last year. I'd love to be proven wrong on this, but I just haven't seen the data or economic theory to support this video's position.