Post - yes. Fill- no. I filled an application and after the job closed was sent an e-mail saying that the job is not being filled at this time. Since things are computerized, these jobs were in the que before hiring freeze started.
NAPS you are correct. At least some of these jobs are posted just to keep a pool of qualified applicants ready in case the job really opens up.
Some positions are advertised on USA jobs but the agency already has someone working for them who will get the job but by law they have to post it. This kind of stinks since you can waste aot of time and effort applying for a job that is already filled and that you have no chance of getting.