Not actually literally an Aarakocra in the D&D universe, it's just the name AJ gives this form due to the similarities.

In this universe, Owl-AJ's DNA is a bit unstable due to the experiments he went under when he was held hostage by the bird-pirates who kidnapped him. So that's why he's not really consistent between having wing-hands and talon-hands. But now, in this form, he has the best of both! Minus any kind of shirts or coats that can fit him...