You call them Progenitors because they came before your current race and had a hand in the formation of this one. They are not connected to the Draco. They are not human either, but the designers. They arrive now as a part of their plan to return and observe their creation.
Their purpose is observation. The Draco fear them, are not “sanctioned” by them, and will thus back off.
The explanation of why they are here will come from them.
They will not stay permanently.
It is not a “fake invasion”.
They mean no harm to the race.
With this knowing you are forewarned and can then assist in explanation.