They are still hiring. Sure, big enterprises keep hiring essential employees even in tough times. But these aren't essential jobs. Many of them seem like the sort of job a private firm, in a financial crisis like the feds are in, would consolidate with another job or leave unfilled. (The first one that jumps out is the "Associate Administrator for Administration" at the Department of Transportation, which pays $119,554 to $179,700. ...You don't have to be Peter Drucker to realize that this position does not have to exist.)
Part of the problem, of course, is that since it is virtually impossible to fire an actual underperforming federal employee, conscientious administrators have to hire new people (or consultants) to actually do the work the unfireable employees aren't doing.