I suspect it was intended to mean HF aeronautical, then again, most of the bulk "Chinesium" electronics resellers often do not have much a clue about the tech specs of what they are selling anyway.
Edit: Oh yeah, as of last check, my ATS-20 still is working. I think it is on V3.0.7c firmware, which is a revision behind, so I need to get around to flashing an update.