I’ve never heard of most of the things mentioned in that article. But there are a couple that have been in popular pseudoscientific literature for a while. One is the Ancient Model Aircraft. It was talked about in “Chariots of the Gods?” by von Daniken. I don’t recall exactly what he said about it but with his reputation I’m sure it wasn’t based on objective research. The article’s description destroys any scientific credibility they may have had by promoting the claim it’s an aerodynamic marvel and able to glide. A little elementary physics will dismiss this as fantasy. It’s made of gold and therefore extremely heavy for its size. That would mean its flight characteristics would be identical to that of a brick. Modern aircraft designed that way need powerful engines to keep aloft. Some even earned the nickname “Widow Makers”. This artifact, like they say, resembles an aircraft, but that doesn’t mean it is. It’s more likely some kind of bird.
The other artifact I recognize is the “Baghdad Battery”. This was also made famous by von Daniken in “Chariots of the Gods?”. Real scientists dismiss the theory it was a battery. The truth is no one knows what it was for. Sure, if you fill it with acid an electric current will flow between the copper and the iron rod. But that will happen any time you have dissimilar metals immersed in an electrolyte. In elementary school, we did an experiment where we stuck a copper and a zinc rod in a lemon then measured the voltage between the two. This effect, called electrolysis, is unavoidable. In fact, boaters go to great lengths to prevent electrolysis from eroding the underwater metal parts (propeller, propeller shafts, rudder fittings, etc.) of their vessels; often unsuccessfully. There is no evidence to indicate the “Baghdad Battery” was ever filled with acid. If people of that era did know about and use electricity, there would be a lot of other evidence around. Why is this the only thing that remains?
If the other eight things are as well researched as the above two items, I don’t think there is anything to be puzzled about. I’m sure a little investigation, such as consulting respected archaeologists that specialize in those particular time periods, will reveal their true identity and purpose.