A Stict OOA hypothesis, based on genetics is no longer tenable. So the current main hypothesis is a hybrid OOa with a bit of multi-regionalism thrown in to the mix.
We have an introgession of denisovian DNA into AMH genetics in australia, micronesia, a bit in south americans and a hint in some east asian.
This signature is not found in South asia, india, near east, most of siberia or western eurasia.
This rather effectively relegates on out of australia as highly unlikely.
As all non SSA african have some Neanderthal genetics, it is also apparent that a large migration back into africa never happened in the last 70k years