Medical idol being destroyed?
https://www.biblestudytools.com/dictionary/nehushtan/
>Whiteness
This isn't referring to a skin tone, this refers to purity of character and virtue.
What the "professor" is really saying: "Godliness has an end date. We gotta take those who love God out."
However:
The earth is the LORD's and all its fullness, the world and those who dwell therein.
https://www.biblehub.com/psalms/24-1.htm
I decided to consider what was going on 1000 years ago (at least what I could find on line). This article is pretty interesting. Even mentions Kiev. It was written from a "western" perspective, so I don't know what was going on in Asia, etc.
https://www.ancient-origins.net/history-famous-people/basil-ii-0011055
The mention of Basil II is because a lot of the significant events of the era appear to have involved him as emperor.