As an analogy using our own known technology and scientific understanding. We probably could already construct a probe that eventually could read the Centauri star system near us. And we could have this probe designed in a way that it contains a 3d printer and once it locates the raw material needed for this 3d printer, then it can print a new copy of itself.

Now extend this slightly in that the probe has a 2 way link, perhaps very slow, light years obviously in distance, but can eventually send and receive information from earth.

Then based on the sensor data collected in Centauri, we can certainly imagine we can send updated schematics for new designs to print.

Yes this all took 100s of years. But a future technological civilization model on us, is likely headed that way.

Lastly, perhaps biology once better mastered, can be manipulated a bit like 3d printing. This could potentially explain reports of humanoid entities. The advanced probes are printing what they observe.

Obviously all this is hypothetical speculation but the point is even biological evidence doesn’t necessarily mean actual original beings traveled many light years here.