Course in order to get 4% unemployment you had to count overtime as a separate job to boost up the numbers.That's because the GDP was only slightly negative, and Unemployment was in the 4% (better than average US unemployment)
Remember the COVID recession wasn't based on two quarters of negative GDP, but on the economy coming to a crashing halt. With double digit unemployment, and double digit negative GDP
The labor participation rate was still the lowest since the Great Depression.