Clickbait. Misrepresentation of the article which clearly states the object is near escape velocity with aims at identifying possible explanations and the classification of other similar objects. The article states the relative velocity at 456 +-27 km/s which is much lower than the local galactic escape velocity of 540km/s. Calculating an objects escape velocity isn't a simple comparison of course and depends on many factors, which the cnn article ignores for the sake of a sensational headline. The academic article is an interesting read.