This is a fun read. When I accepted the big bang theory, I would have said such an idea is preposterous due to the timeline of events and what we think we know about colonization, it is super unlikely a being would leave if it was ever to arrive, or that more would not show up.

But now, with a never ending timeline in the electric universe / plasma cosmology, this idea seems partially plausible.

I would prefer to think they arrived and are the missing link in evolution, using rapid evolution in labs to produce the perfect humanoid.

Which would of course render prior humanoid activity on the planet invalid.