Learn English – In the sentence: “Drinking and driving IS dangerous”, why does the verb “to be” need to be singular

The word Olympics is plural. It's also a shortened expression of the Olympic Games.

The history of the games is discussed on the official website:

Olympia, the site of the ancient Olympic Games, is in the western part of the Peloponnese which, according to Greek mythology, is the island of "Pelops", the founder of the Olympic Games. Imposing temples, votive buildings, elaborate shrines and ancient sporting facilities were combined in a site of unique natural and mystical beauty. Olympia functioned as a meeting place for worship and other religious and political practices as early as the 10th century B.C. The central part of Olympia was dominated by the majestic temple of Zeus, with the temple of Hera parallel to it.

The authors of the article you referenced are free to use whatever style they choose, but I would argue that they are in the minority.