Also, your initial statement is sine dicendo, therefore useless and rather questions the reason of your comment.
Obviously the Antikythera mechanism is impressive because of the size and detail of the gears and their usage for computation.
The reason for my comment that our ancestors were not as stupid as some contemporary people think, was in reaction on another post which stated that the Antikythera Mechanism was probably just a hundred-year old clock thrown overboard in recent times (I should have quoted that comment for clarity).
Some people cannot fathom that ancient people could realize impressive feats, just like we can. Take for example the pyramids: "the old Egyptians could never have build themselves, they must have gotten extraterrestrial help". This condescending view is also propagated by Von Daniken in his 'Chariots of the Gods' books.
It's a contender in the list of 'biggest pseudo scientific bs', runner up is the scientology junk.