Other Possibility
It could be that ATH is taking advantage of oil prices to pay down some of their debt before refinancing. This would have two benefits; one is the obvious lower balance to refinance, and secondly is that paying down debt using fcf demonstrates they are less risky therefore commanding a lower loan rate. I personally feel that they could easily have completed a deal by now as others have demonstrated so it makes me believe they are attempting to achieve something else before refinancing.
One thing for sure, if oil stays at or above the 2021 Q1 level, they are generating great fcf.
It could also be that they will announce the refinancing as part of the upcoming Q1 results.
This is all pure wild azz speculation on my part.
glta