It might mean the test is canceled.
Or it may have filled after you signed up.
Technically if you are from Arizona (or several other hotspots) and have to fly to Illinois for the exam, you would have to quarantine two weeks upon arrival. I don’t know if the College Board is trying to keep up with that sort of thing or not. Unlikely, but possible.
The best way to find out if your test is canceled is to call directly the school where you are scheduled to test and ask the school if they are still on. They will know. We did this for DD after reading that advice here on CC, and we were able to reschedule at another center next month. A whole week went by after before CB officially announced the original site’s closing.
Good luck. We all need it!