Ok I actually rewatched this turd, and some points I missed are making this thing make…well a little more sense.
Ok the intro, is it Earth or not? I don’t think it matters but I do think we are being shown the start of life on Earth period. Odd that you can see some kind of plant life is some shots, maybe the Jockeys did not start life on Earth but started a later form or intervened somehow.
Second is that the Jockeys have been visiting Earth repeatedly for billions or millions of years, and as recently as 30K years ago. They did not just plant the seed, they have been tending the garden all along. Why did they leave behind a map to the bioweapons lab planet?
Conjecture here…rebel Jockey stranded or exiled on Earth? Trying to show future humans who he knows it is likely will develop space flight the truth?
Is the mural depicting the xenomorph/alien actually some kind of warning? Not a mural at all?
I think the biggest unanswered questions are what went wrong at the lab? Random accident? Why have they been seeding and tending planets with life only to have developed the xenomorph to wipe out said life? Running simulations?