If the finding were correct
The conclusion was it was possible the first man and women did not know each other, they may have. There are more than one route to the same place in the track geneticaly speaking. This gives no real conclusions as to the first man and women. It does give evidence toward some sort of catasrophic event that dwindled homo sapiens down to just a few people at one time for only one mother line to have survived. We likely almost disappeared at some time or another!
I dont doubt the last sentence a bit. It wouldnt surprise me if humans were older than they think as well. And im not just talking about finding a skeleton that moves it back 50K years, im talking much older.
Human history is something we will probably never nail down completely and that is a shame :/