I love this kind of stuff, even though I don't think aliens are involved.
To me it just shows that:
a - we are pretty smart as a species - and of course while our accumulated knowledge is greater now, the actual brains of people thousands of years ago were as developed as ours today
b - we can accomplish a lot with our eyes/fingers when given time and the right skills - today of course a lot of stuff is manufactured out of sight, or seen as needing assistance. The truth is that, with simple tools, the right knowledge and time (which in some ways the ancients had more of than us) you can accomplish very similar results
You have to wonder who much further advanced we could be right now if history wasn't littered with the collapse of civilizations (for various reasons) all of which negatively impacted our forward momentum as a species, essentially serving as a series of 'setbacks'.
Try to be reasonable... its easier than you think...
