In reality, the jobless rate didn’t decline at all. It went up.
If you look at U6 which is the broadest measure (U-6 Total unemployed, plus all persons marginally attached to the labor force, plus total employed part time for economic reasons, as a percent of the civilian labor force plus all persons marginally attached to the labor force) it declined from 14.3% to 13.8%. this is much more akin to the “real” unemployment number.