They were probationary employees, give it a rest.
You understand what that means, yes?
Unless it means something different in the States, over here most jobs have a probationary period which protects the company more than the employee.
So if they hire someone and find out they're hopeless then they have a right to get rid of them quickly. Just because someone is new it doesn't mean they're no good.
What this amounts to is effectively saying they'll get rid of anyone who joined in the last year. I guess it's the easy thing to do because the probation period by definition is one in which someone can be sacked without much process. But it's also pretty arbitrary and could leave some teams very understaffed if they've hired a lot of people in the last year.
If this isn't an issue then why would they be trying to re-hire them at all?
I'm not even arguing that there aren't too many federal employees (I honestly have no opinion, I don't know enough about your system).
But if you want to reduce the numbers you do so in a strategic way, not just bowling in and use some arbitrary date of employment to get rid of people.
Trump said he wanted a meritocracy. Well OK, I can get on board with that. But then you find people with merit and retain those, not just arbitrarily decide that anyone who joined in the last year needs to go.