I was looking at Wikipedia's article about demographics, and noticed that the 'Ethnicity' section has been deleted. I'm not massively familiar with the Wiki editing system, but it seems to have been done on October 10th 2020 by some random user who gave the reason "This section is irrelevant to the article."

An article about demographics, and ethnicity is "irrelevant"? You have got to be kidding.

https://en.wikipedia.org/w/index.php?title=Demographics_of_the_world&oldid=982751947

The section originally linked to this page (which does still exist): https://en.wikipedia.org/wiki/List_of_contemporary_ethnic_groups

This edit to delete the section doesn't seem to have been challenged by any of Wikipedia's regular editors and it happened nearly 6 months ago! So, random woke racist leftist with an axe to grind? Or the CCP (who have been caught editing inconvenient articles before) trying to make it just that little bit harder to see the impact their 'cultural difference' camps are having on their minority populations (Mongolians, Uighurs, Lisu Christians etc.)?