You are right, Aaudio is available since Oreo only and the device is 3 version older. Additionally Netflix 's video playback is not a low latency use-case, so it shouldn't use Aaudio even on recent devices.
My comment was about the parent's affirmation that low latency apps should be scheduled by interrupt.
The previous options are either SLES or AudioDriver, both of which are bad in their own ways.