No, of course not. Why would they? It’s not trying to explain what Easter eggs are in general, nor is it acting like Swifties coined the term. The article is trying to explain that in the context of Taylor Swift, easter eggs are usually about upcoming projects or such things.

The article could have said “‘Easter egg’ is a term which means a bit of information or a feature which is left hidden as a surprise for people to find. In the context of Taylor Swift, easter eggs are hidden bits of information which often point at upcoming projects.” That would be overly wordy and unnecessary though because most people already know what Easter eggs are and thus won’t assume it’s claiming that Swifties invented the term.