People appear to be conflating the original murder-upload that left the Oafans extinct in meat-space with what Iafa did.
The prologue to this book shows the murder-upload, and we can see that Iafa isn't present: the two people responsible are called Mnelalae (who appears to be the xeno-archaeologist from before) and Yaeyoefui.
It seems like Iafa came after the Oafans were already extinct in real-space, and "imprisoned" them by confining them to the hardware that Putzho found.
All of that said, I don't know whether or not we know what Iafa was like ten million years ago, so it's still possible that Mnelalae really is the same person. Iafa remade himself when they were reactivating Breath Weapon, and the previous incarnation was implied to be female.