They do not need to use emergency use to expedite.
IOW, all EUAs (COVID related anyway) are due to an emergency, and multiple tests/treatments/vaccines are EUA-approved only because there’s a pandemic that creates demand beyond what’s already available (so even if 50 tests are approved, a 51st is deemed “needed”).
The FDA isn’t making a decision here, it’s the CDC (that has other priorities to focus on) that’s withdrawing their request for EUA approval, perhaps to focus on other things.