The article didn't make that up, it's a well-known thing. I mean, I guess Lamar Hunt could have been lying, but he's definitely the first one to use the name "Super Bowl" and he always said he named it after the Super Ball.

Here, it's on Wikipedia because of course it is:

Lamar Hunt, owner of the AFL's Kansas City Chiefs, first used the term "Super Bowl" to refer to the NFL-AFL championship game in the merger meetings. Hunt later said the name was likely in his head because his children had been playing with a Super Ball toy; a vintage example of the ball is on display at the Pro Football Hall of Fame in Canton, Ohio. In a July 25, 1966, letter to NFL commissioner Pete Rozelle, Hunt wrote, "I have kiddingly called it the 'Super Bowl,' which obviously can be improved upon."

https://en.wikipedia.org/wiki/Super_Bowl