I suppose it depends on why they don’t have security clearance. If it’s someone who could never qualify for it, that would need to be announced and explained.
If it’s simply a candidate who doesn’t yet have it, that’s something that should be known for the same reasons. They don’t have all the information other candidates do, but are operating with the information they do have.
Thank you, I’m an outsider and didn’t know the who or why of the question.